Khloe Kardashian's boyfriend, French Montana, is probably running around on her...according to KISS 108 Matty In The Morning show intern Mariela...who says French put the MOVES on her in Lawrence, Massachusetts last weekend...

Here's part of her description...

“He climbs on top of me. I say, ‘I’m not about this life. I have morals. I have a lot to lose.’ He says, ‘I have a lot to lose, too. You know that I have a girlfriend!’”

She also claims that he licked her ear. 

Listen to the interview with Matty (it starts around 2:30) and judge for yourself..