My ex GF (Jenn) and I dated for 4 years. She was a freshman and I was a sophomore when we met. A mutual friend introduced us when I was on a break with my GF at the time. We hooked up for about 2 months, but I decided to get back with my GF. Jenn was crushed when I told her I was getting back with my GF, and was very angry at me. Jenn and I really liked each other, but I still had real feelings for my GF at the time and thought I needed to give it another shot with her.
After getting back with my GF, Jenn and I stopped talking, but I would often see her when I went out. Many times when I would run into her at a bar, she would intentionally try to make me jealous. She would purposely flirt and hookup with guys in front of me. She would often make eye contact with me from across the bar, and made sure that I was watching as she approached another guy or left the bar with him. This drove me wild and turned me on so much.