<human>: Can you condense the text into three sentences or less?

We pre-emptively took a break going into college. That lasted about 4 days. Big mistake. When we started talking again, i found out she hooked up with her best friend the same night we decided to take that pre-emptive break. I had always been suspicious of this person throughout our 3 years together, so it killed me. We went through this awful on/off period for about a week. Kept saying she loved me and that there was no one else she wanted. I couldn't take it anymore. According to her, she wanted to make it work but wanted her own circle of friends, didnt want to bring me to parties most of the time, and had an issue with seeing me routinely (is once a day really too frequent? like come on). It felt like she wanted me to break up with her the whole time. I couldn't take it anymore. Basically, I broke up with her 3 weeks into school. I bump into her at least once a day. Our school's campus is very small. I found out from other friends that they have seen her fooling around with douch-ey guys at parties (after having separated, so technically not cheating, just moved on way quicker than i would have liked). I desperately want to move on and socialize, but all I really want to do is keep to myself and sulk. I have no good friends at the moment, I don't really connect with anyone yet. I have social anxiety to begin with, so this just further agitates the issue. I don't know what to do.
<bot>: Brokeup with gf 3 weeks into school. Small campus so I see her all the time. What do i do.