Selena Gomez cannot get over the fact that her ex-boyfriend Justin Bieber was purportedly dating Kourtney Kardashian, Hollywood Life reported Thursday. Bieber recently made headlines because of his rumored relationship with Kardashian and for saying that he considered older women to be “dominant."

“Selena can’t seem to get past the fact that Justin is dating Kourtney Kardashian. She talks about it all the time. At first she was shocked and didn’t believe it, but then she started to think about it and realized the writing was always on the wall. He’s always had a thing for older women,” a source told Hollywood Life. “He even mentioned that he thought Kourtney was the best looking Kardashian. Selena just thought it was a schoolboy crush -- she never thought he’d act on it.”

Gomez, 23, also reportedly sent angry text messages to Bieber, 21, over the rumored relationship, which she believed was “incestuous.” Gomez had also confronted Bieber over the matter and reportedly demanded answers from him over his alleged relationship with Kardashian, who is 15 years elder to him.

It was reported recently that Kardashian was dating Bieber only to annoy her former partner Scott Disick, with whom she has three children.