Did my ex cheat on me?
I (25 m) and I started dating a girl (23 f) in our first semester in law school. At first it was great, but she had some issues pushing my boundaries and that created some tension. She also refused to let anyone outside of our immediate friend circle know we were together, which I thought was strange since she wanted to do other bf/gf things like going out to dinner. We were together for about two months when she broke it off with me right before finals. On the night of our last final, our entire class decided to go to a bar to celebrate, and she was kissing a guy, which surprised me because she was always super shy in social situations. I find out once second semester starts that they are now a couple. The more I thought about it, I realized she would not have had time to start dating someone new from the time she broke up with me and by the time finals ended, especailly because she goes crazy with studying. I also found an old text where she mentions getting lunch with some mutual friends and the new bf while we were still together. Finally and easily the biggest potential red flag is that I later learned she was dating a different guy before she started pursuing me.
Then at my current job, I was told by someone at my school that she remembers seeing my ex with her current bf together a lot during the time we were dating, and said she was probably testing which guy she liked better.
Does any of this make sense or am I looking too much into it?