Weeks away from the birth of their first child, cheating rumors swirl around Khloe Kardashian and Tristan Thompson. It's nothing new, says an insider.

Damning Evidence

The allegations first came to light when photos and video footage, which purported to show the Cleveland Cavaliers player cozying up to an unidentified brunette at a bar in New York City, surfaced.

A subsequent video showed a man identified as Thompson entering his hotel at 5 a.m. accompanied by a brunette.

The footage was then posted online showing Thompson kissing one woman while being groped by another at a bar outside Washington, D.C. The footage was allegedly recorded back in October 2017.

The scandal has rocked the Kardashian camp, particularly with Khloe far away from her family. She's nesting in Thompson's home in Cleveland as she prepares for the birth of their daughter.

Not The First, Won't Be The Last

However, according to a source close to the couple, this has been a long time coming.

"Tristan has been consistently cheating on Khloé. He's a serial cheater. And there will be more women to come out of the woodwork," the source claims.

Kardashian is nine months pregnant with a baby girl, due to pop at any minute, so the timing could not possibly be worse.

Neither Kardashian's reps nor Thompson's have publicly commented on the situation as of yet.

The extended Kardashian-Jenner clan are devastated for the mother-to-be, the source revealed.

"They are heartbroken for Khloé. They didn't realize how deceptive Tristan could really be," the source said.

Meanwhile, Thompson's ex, Jordan Craig posted an Instagram message seemingly alluding to the situation.

Craig shares a 16-month-old son, Prince Oliver, with Thompson. Kardashian began dating Thompson while Craig was pregnant with his son.

 "If you respect yourself and you respect others, you would never make light of the misfortune of anyone, nor would you feel indemnified when it comes at the expense of others," she said in an Instagram story.

Focusing On The Positives

As for whether Kardashian knew about Thompson's alleged indiscretions, it's also been suggested that she was focused on the good things about him, ignoring hints of any issues.

"As far as she knew, there were no negatives. Once she made the decision to commit, she was all in and trusting," the source claims.

Kardashian went through a difficult time with her ex-husband Lamar Odom and has been careful about getting into relationships. However, a family friend claims she went full force with Thompson.