I dont think they break up. I think... or better hope, theres a possible poly route with those two. But now she is in college too and that means there is more interaction with her (and some Tommy drama, im quite sure he secretly is in love with her) an her character will be fleshed out more.
I have three playthroughs now, one without any knowledge of the game doing mostly gut decisions (ending up as a huge chick, Maya and Josy will only be friends and i will probably ending up with Jill), one as massive chick, one as massive dik with help from the walkthrough. In the DIK-Playthrough i found the swimming pool scene with Sage really cool and well written and there is definitely a lot more to Sage than i thought before. My new favorite.