Khloé Kardashian and her new boyfriend Tristan Thompson are inseparable — and that's causing serious problems between the NBA star and his baby mama!

Sources reveal exclusively to Life & Style that Tristan's pregnant ex Jordy Craig feels completely "disrespected" by the KUWTK star.

MORE: Khloé Kardashian Makes Out With Boyfriend Tristan Thompson on Snapchat!

"Tristan would be with Jordy at the doctor’s office, and he’d be off in the corner FaceTiming Khloé,” says a source. “It was absolutely infuriating to Jordy because she could barely get Tristan to focus on the birth of their baby.”

And Jordy, 25, is placing all the blame on Khloe, 32, who jetted off with her 25-year-old beau on a Mexican vacation just weeks before the birth of his first child.

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"Jordy wants Khloé to back off,” adds the source.

For more on your favorite celebrities, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for photos of Khloé’s transformation over the years.