I think it's very obvious, at the beginning of the game, that Veronica is a FWB. Veronica has feelings for him, but he sees the relationship as more of a friendship, that has a sexual component to it.
This is further reinforced by the lack of MCs desire to have her involved in his life beyond what was on the surface level. It's why I'm not against being at a distance with her, nor her breaking off the supposed 'relationship' when he refuses her. She wanted something that he was not willing/comfortable with, and when he doesn't (or does) reciprocate, the relationship collapses (or goes to the next level).
Her competition with Jasmine was utterly childish on her part, and really only threw me off the first time I ran through that scene. I get it, you're jealous, but you're also jealous at a girl that is 10? 15? years younger, and your response to it is to try and match the freak? God damn.