<human>: Can you give me the gist of the text in a nutshell?

My girlfriend and I were dating for about 5 months and there was a lot of suspicious activity from the beginning, but she ended up convincing me that I was just being paranoid. After breaking up for unrelated reasons I learned that she had been cheating on me pretty much the whole time. Needless to say I was devastated. Every time I would see them together at school the guy would make a very flashy point of making out with her or grabbing her tits or something like that. She has expressed that she sees nothing wrong with this behavior and she has expressed no remorse and has never apologized. I cut her out of my life and I haven't had to see her for 4 months and I'm not feeling too great about going back to school in one week.

Extra Fun Fact: School starts on my birthday (the 13th)
<bot>: Girlfriend cheated on me and I'm going to have to see both her and the guy she cheated on me with at school.