Classic monkey branching. AWALT!

Original Post: https://www.reddit.com/r/relationship_advice/comments/aj79wj/i_think_my_22m_girlfriend_20f_might_be_cheating/

TLDR: My girlfriend was really close with my roommate, I suspected cheating, was confirmed at a party when she made a scene about her friend kissing said roommate.

Basically, after I kicked my gf out of our party, I assumed we would all lay low for a few days. I was wrong. The day after the party, my roommate (I decided to call him Chet) knocked on my door and tried to talk, but I ignored him. Less than an hour later the (ex) girlfriend sends me a long text, at first apologizing, then explaining that her screwing Chet couldn't have been avoided, because while I was a good boyfriend, I study and sleep too much. Ok. She then told me she would be willing to work through this if I was willing to try to be better and pay more attention to her. I didn't respond to the text.

That night I had a dinner with my parents I couldn't miss, that the ex knew about. I came home to find all of her stuff taken out of my room. I figured ok, she got the hint and moved her stuff back to her dorm. Wrong. I noticed later when Chet's door was open she had actually moved her stuff into HIS room.

I haven't seen either of them, I think they've been out of the apartment to avoid me. I don't even know how to feel. Honestly the breakup is so raw (even though we haven't even really had the chance to break up) and I'm so angry at both of them, but strangely miss them at the same time.