<human>: This guy and I both came out of relationships that were emotionally abusive, which was really a coincidence, I had no idea until I started getting to know him, before it was "official." Admittedly going in, I was really scared just getting to know this guy because of what had previously happened between me and my ex. 
I met this new guy through a friend, made sure to really get to know him and I just genuinely felt good about the entire thing. I was ready to jump in which felt so special to me because I've been really weird about giving anyone new a chance. Waited to have sex, just spent the first about 4 weeks just hanging out as friends and really getting to know each other.
He was basically waiting on me to say I was ready and two nights ago, I told him I was ready to be his girlfriend. We had sex, that night and this morning. It was only like 6 hours ago while I was sleeping that I got a phone call from this girl he had apparently had sex with while I was asleep. She sent me screenshots of their conversations as proof so I called him. He answered, he admitted it though very apologetic and remorseful. Because of past experiences, including the last, I told him I just couldn't do it. He had no reason to sleep with her, he said he didn't even know why he did it, just that he felt desperate but that's as far as his explanation. He kept apologizing and saying he didn't want to lose me but at the same time was kind of relaxed about letting me go. Is that a sign in itself that I should leave this alone?
 
Right now I'm sort of torn between actually giving this guy a second chance since I felt that he was something special, or if I should just let it go completely.

Can you condense the text into a few key points?
<bot>: Fresh relationship after abusive exes on both ends, he cheated the second day with ex, admitted it, not sure if this is worth giving a chance? Should I, since this was so recent and since he admitted it?