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

A little background story . I was in a relationship with my ex for about 4 and a half years and its been about a year since we broke up . We used to go to the same college and are in the same class . We've had a break from college for about a year and we did finally call it quits when we had to take the break . (this was August 2014)

While we were dating I never did prove to be what you'd call a good boyfriend. So our relationship was pretty on-off . So in the month of December 2014 she started talking to her ex again and I didn't like that much . I told her she should try and not meet him in private but I wasn't very firm about it since i did trust her alot and i knew she'd never do something that would disappoint me . Well , that cost me . She did cheat on me with her ex twice while we were dating and now she's currently dating that guy . 

The main problem here is that i don't really feel like its all her fault . Part of the reason she did cheat was probably because i didn't live up to her expectation of a good boyfriend. 

After this saga with her , I've had some serious trust issue with other people . I can safely say I didn't trust anyone more than her and now i cant trust anyone at all . Its eating me inside for really long and I really don't have to many close friends who i can share any of this with .. 

I really would love for anyone who has felt the same to give me some advice . College starts again in July and i dont know what having to see her face daily will do to me.. Need some help ..Thanks in advance .
<bot>: EX cheated on me 1 year ago with her ex . Destroyed my trust in people . Need help with the trust issue and some closure . (Will be studying with her for one more year starting July)