<human>: Could you distill the essence of the text into 1-3 sentences?

To put a long story short; It was an intense relationship, about 4 months long by the end of it. It felt like a lifetime thing, which probably just adds to the intensity. Both 20 at the time, he's just recently turned 21.

Anyway, he was always a bit shady with other girls, which I let go because I trusted him.. in spite of there being more than once when I shouldn't have. I always found out about these things by accident or just by guessing them according to his moods. There were faults on both sides which led to an eventual "break period" where we were still partly together, just taking some time off, I suppose. 

During this break period, which was about two weeks long, over the holidays last year, he met another girl and had sex with her. A few days after he met her, we had our "talk" which led to us finally breaking it off completely. We'd still been having sex during the break period as well. 

He seems to think he had no attachment to me from the moment we started our break period, except for sex. In his words on the final night though "It's too late to fix it". Keep in mind that this is after he'd met and slept with his current girlfriend, and he didn't know I knew about it. So I know that was an influence on his decision there. 

That's the basic story, but I'm having an extremely difficult time trying not to be a huge bitch every time I speak to him. I just want to move on and be loved again, and everytime the possibility comes along, I shut myself off from it. I've been going out a lot more and meeting a lot more guys as well, it just happens that whenever I see a similar quality to one that the ex has, I can't see myself with that person for a long time either. I'm trying to be friends with my ex for work purposes, but I've basically cut down all but the necessary contact as much as possible.
<bot>: I think what he did counted as cheating (at least in part), he doesn't. I just want to move on. Advice?