It's been very vague as to what happened and so far she hasn't said who did what to her. She disappeared and hasn't explained where she went or what happened (as far as I can recall) and then comes back preggers. I don't know if in fact the MC does know but we don't or if to the current time in game the MC doesn't know.I mean, we don't KNOW if she fucked him over, the way she acts about the pregnancy it's very likely that it wasn't consensual.
Regardless, she is way too needy, desperate, and codependent. Not a personality type that I like.