So... Patrick and Vania are former friends, he has a crush on her and they went on a few dates that clearly did not go in Patrick's favor in the end. There's no indication in the slightest that Vania is in any way interested in him romantically, much less intimate with him. He's a classic bully who is intensely jealous of MC, but he has not given Vania any reason to assume that he'd harm her, so she has nothing to fear by hearing him out. If you recall in that same scene, she also shot him down hard making it very clear that she never had any feelings for him.
How you could watch that scene and then deduce that it made Vania a "slut" must have taken a level of incel energy hitherto unseen on this thread.