Tristan Thompson 'has been consistently cheating' on Khloe Kardashian: Details on his alleged infidelity

Tristan Thompson's alleged cheating on Khloe Kardashian is not a surprise to those closest with the NBA star.

After the Daily Mail published footage on Tuesday night reportedly showing Thompson kissing a woman at PH-D Lounge in New York City over the weekend, TMZ followed it up with a video of Kardashian's boyfriend bringing the unidentified woman into his hotel room around 5 am. Page Six reports that the woman is Instagram model Lani Blair, who recently turned her account private.

TMZ then published a video from October reportedly showing Thompson kissing one woman while another woman groped him at a hookah lounge in the Washington, DC, area.

Meanwhile, Khloe is at their shared home in Cleveland nine months pregnant with their first child together.

"Tristan has been consistently cheating on Khloe," an insider told People. "He's a serial cheater. And there will be more women to come out of the woodwork."

The source added that Thompson's cheating scandal "has been a long time coming."

See photos of Khloe and Tristan together:

Though it's unclear if Khloe herself was aware of her boyfriend's alleged cheating, sources say that the revelations have come as a shock to her famous family who are "heartbroken for Khloe."

"They didn't realize how deceptive Tristan could really be," a source told People.

And while this news is surely devastating for the mom-to-be, her tight-knit family is making sure to continue to support her, while reminding her on what really matters, which is her baby due to arrive any day now.

"The video hasn't stopped the Kardashians from making sure her day will be one of love and respect," a source told ET. "They won't let any news change the importance of how beautiful this birth is for Khloe. They want her to focus on having a healthy experience."

The source added that the family is trying to remain optimistic about the whole situation and what it means for the future of Khloe and Tristan's relationship, too.

"At this point, Khloe's family wants nothing more than to believe that he is a stand-up guy and that this was a setup," the ET source added. "But only time will tell."

See photos from Kim and Kourtney's current trip to Turks and Caicos:

The videos come as sisters Kim and Kourtney are soaking up the sun in Turks and Caicos. On Wednesday morning, Kim shared another bikini photo with Kourtney and a friend and captioned it, "Ride or Die," which hints at her family's extreme loyalty to one another, especially amid public scandals such as these.

On Monday, one day before the video of Thompson went viral, Khloe took to Instagram to share a photo from their maternity shoot that read, "We are ready whenever you are little mama."

Sources claim that the entire Kardashian-Jenner family has unfollowed Thompson on Instagram, which appears to be false, as he's still listed under the limited number of accounts that each member of the family follows on the social media site.

Khloe Kardashian is due to give birth to her first child, a girl, this month. Tristan Thompson has another son, Prince, who he shares with ex Jordan Craig. He reportedly broke up with Craig while she was pregnant to start dating Khloe.

See photos from Khloe's pregnancy:

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