Ariana Grande's rumored boyfriend Pete Davidson says mental illness doesn't make a relationship 'toxic'

One day after Ariana Grande spoke out about her "toxic" relationship with Mac Miller, her rumored new boyfriend, Pete Davidson, appears to be defending their romance. 

The Saturday Night Live star took to his Instagram Story on Thursday to defend himself against those commenting that his mental illness prevents him from being in a successful relationship. Davidson revealed last year that he was diagnosed with borderline personality disorder.

"Normally I wouldn't comment on something like this cause like f**k you," he wrote. "But I've been hearing a lot of 'people with BPD can't be in relationships' talk. I just wanna let you know that's not true. Just because someone has a mental illness does not mean they can't be happy and in a relationship. It also doesn't mean that person makes a relationship toxic." 

"I just think it's f**ked up to stigmatize people as crazy and say that they are unable to do stuff that anyone can do," Davidson continued. "It's not their fault and it's the wrong way for people to look at things. I may be crazy but at least I'm aware of it and not afraid to be honest about it and I'm not hiding behind a Twitter or Instagram account."

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Pete Davidson from 'Saturday Night Live' out and about
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Pete Davidson from 'Saturday Night Live' out and about
SATURDAY NIGHT LIVE -- 'Alec Baldwin' Episode 1718 -- Pictured: (l-r) Pete Davidson and host Alec Baldwin during the monologue on February 11, 2017 -- (Photo by: Will Heath/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - FEBRUARY 26: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) (L-R) Actors Jeff Ross, David Spade, Pete Davidson, and Cazzie David attend the 2017 Vanity Fair Oscar Party hosted by Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 26, 2017 in Beverly Hills, California. (Photo by Kevin Mazur/VF17/WireImage)
SATURDAY NIGHT LIVE -- 'Kristen Stewart' Episode 1717 -- Pictured: (l-r) Kate McKinnon as Grandma, Pete Davidson as Grandpa Joe, host Kristen Stewart as Charlie, and Vanessa Bayer as Grandma during the 'Golden Ticket' sketch on February 4th, 2017 -- (Photo by: Will Heath/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE -- 'Aziz Ansari' Episode 1716 -- Pictured: (l-r) Melissa Villase�r and Pete Davidson during the 'Attorney Ad' sketch on January 21st, 2017 -- (Photo by: Will Heath/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE -- 'Kristen Stewart' Episode 1717 -- Pictured: Pete Davidson during the 'Meet Cute' sketch on January 31, 2017 -- (Photo by: Will Heath/NBC/NBCU Photo Bank via Getty Images)
SATURDAY NIGHT LIVE -- 'Kristen Wiig' Episode 1711 -- Pictured: (l-r) Pete Davidson and Colin Jost during Weekend Update on November 19, 2016 -- (Photo by: Will Heath/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 17: Pete Davidson attends the 2016 American Museum of Natural History Museum Gala at the American Museum of Natural History on November 17, 2016 in New York City. (Photo by D Dipasupil/FilmMagic)
LATE NIGHT WITH SETH MEYERS -- Episode 438 -- Pictured: (l-r) Comedian Pete Davidson during an interview with host Seth Meyers on October 25, 2016 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
WANTAGH, NY - SEPTEMBER 10: Comedian Pete Davidson performs onstage during Oddball Comedy Festival at Nikon at Jones Beach Theater on September 10, 2016 in Wantagh, New York. (Photo by Kevin Mazur/Getty Images)
LOS ANGELES, CA - AUGUST 27: Actor Pete Davidson and Cazzie David attend the Comedy Central Roast of Rob Lowe at Sony Studios on August 27, 2016 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - MAY 24: Pete Davidson attends The New York Police & Fire Widows' & Children's Benefit Fund 4th Annual Kick Off To Summer Benefit at The Bowery Hotel on May 24, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NEW YORK - APRIL 04: Johnny Damon and Pete Davidson join Pepsi to celebrate Yankees opening day, helping fans earn their pinstripes on April 4, 2016 in New York City. (Photo by Bryan Bedder/Getty Images for Pepsi)
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The 24-year-old actor, who was diagnosed as a teenager with Crohn's disease and has been open about his battle with substance abuse, revealed he was sober for the first time in eight years in 2017. He said on Instagram that seeking professional help for his mental illness has "changed my life for the better." 

"I'm simply writing this because I want everyone out there who has an illness to know that it's not true and that anyone who says that is ill and full of sh*t. Mental illness is not a joke it's a real thing. There's kids out there killing themselves. And it's f**king horrific," Davidson wrote. "For all those struggling I want you to know that I love you and I understand you and it is going to be okay. That's all. Love to everyone else."

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A source told ET earlier this week that Grande and Davidson were "casually dating" after Grande's split from Miller, and Davidson's breakup from Cazzie David. 

In her message to fans on Twitter on Wednesday, Grande opened up about her and Miller's relationship, writing, "I am not a babysitter or a mother and no woman should feel that they need to be. I have cared for him and tried to support his sobriety & prayed for his balance for years (and always will of course) but shaming/blaming women for a man's inability to keep his sh*t together is a very major problem."

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Ariana Grande out and about
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Ariana Grande out and about
NEW YORK, NY - JUNE 29: Pete Davidson and Ariana Grande seen in Manhattan on June 29, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 25: Ariana Grande and Pete Davidson seen out and about in Manhattan on June 25, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 20: Pete Davidson and Ariana Grande are seen on June 20, 2018 in New York City. (Photo by Gotham/GC Images)
LOS ANGELES, CA - JUNE 02: (EDITORIAL USE ONLY. NO COMMERCIAL USE) Ariana Grande performs onstage during the 2018 iHeartRadio by AT&T at Banc of California Stadium on June 2, 2018 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for iHeartMedia)
LOS ANGELES, CA - JUNE 02: (EDITORIAL USE ONLY. NO COMMERCIAL USE) Ariana Grande performs onstage during the 2018 iHeartRadio by AT&T at Banc of California Stadium on June 2, 2018 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for iHeartMedia)
LOS ANGELES, CA - JUNE 02: (EDITORIAL USE ONLY. NO COMMERCIAL USE) Ariana Grande poses backstage at the 2018 iHeartRadio Wango Tango by AT&T at Banc of California Stadium on June 2, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for iHeartMedia)
LOS ANGELES, CA - JUNE 02: (EDITORIAL USE ONLY. NO COMMERCIAL USE) Ariana Grande poses backstage at the 2018 iHeartRadio Wango Tango by AT&T at Banc of California Stadium on June 2, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for iHeartMedia)
LAS VEGAS, NV - MAY 20: Recording artist Ariana Grande performs during the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images )
NEW YORK, NY - MAY 07: Ariana Grande attends the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Jackson Lee/Getty Images)
NEW YORK, NY - MAY 07: Ariana Grande attends the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Jackson Lee/Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0862 -- Pictured: (l-r) Singer Ariana Grande with host Jimmy Fallon during 'Musical Genre Challenge' on May 1, 2018 -- (Photo by: Andrew Lipovsky/NBC)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0862 -- Pictured: Singer Ariana Grande performs 'No Tears Left To Cry' on May 1, 2018 -- (Photo by: Andrew Lipovsky/NBC)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0862 -- Pictured: Singer Ariana Grande arrives for an interview on May 1, 2018 -- (Photo by: Andrew Lipovsky/NBC)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0862 -- Pictured: (l-r) Singer Ariana Grande with host Jimmy Fallon during 'NBD or No Big Deal' on May 1, 2018 -- (Photo by: Andrew Lipovsky/NBC)
INDIO, CA - APRIL 20: Ariana Grande performs with Kygo onstage during the 2018 Coachella Valley Music And Arts Festival at the Empire Polo Field on April 20, 2018 in Indio, California. (Photo by Christopher Polk/Getty Images for Coachella)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0862 -- Pictured: Singer Ariana Grande performs 'No Tears Left To Cry' on May 1, 2018 -- (Photo by: Andrew Lipovsky/NBC)
INDIO, CA - APRIL 20: Ariana Grande performs with Kygo onstage during the 2018 Coachella Valley Music And Arts Festival at the Empire Polo Field on April 20, 2018 in Indio, California. (Photo by Christopher Polk/Getty Images for Coachella)
INDIO, CA - APRIL 20: Ariana Grande performs with Kygo onstage during the 2018 Coachella Valley Music And Arts Festival at the Empire Polo Field on April 20, 2018 in Indio, California. (Photo by Christopher Polk/Getty Images for Coachella)
WASHINGTON, DC - MARCH 24: Ariana Grande performs onstage at March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Kevin Mazur/Getty Images for March For Our Lives)
WASHINGTON, DC - MARCH 24: Ariana Grande poses with students at March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Kevin Mazur/Getty Images for March For Our Lives)
WASHINGTON, DC - MARCH 24: Marjory Stoneman Douglas High School student Cameron Kasky and Ariana Grande attend March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Kevin Mazur/Getty Images for March For Our Lives)
WASHINGTON, DC - MARCH 24: Ariana Grande performs during March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Noam Galai/WireImage)
LOS ANGELES, CA - MARCH 10: Ariana Grande is seen on March 10, 2018 in Los Angeles, California. (Photo by GC Images/GC Images)
LOS ANGELES, CA - MARCH 04: Rapper Mac Miller and singer Ariana Grande are seen attending an Oscar party on March 4, 2018 in Los Angeles, California. (Photo by GC Images)
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