Using the cheating bastard to allow her to springboard her relationship with the other ML's. I mean it was pretty obvious she lost all interest in the first ML, her disdain at the fact she needed to sleep with him to dominate him was more than enough for him to ditch her and plan ahead. I really hope the this ML and the other one aren't bastards and more loyal
Edit: A spelling error, also I noticed some people talking about the affection meter. If my game knowledge is correct, think of 50% as someone having a proper impression of someone and acquaintance while at 75% someone would consider them a friend/love interest