<human>: We have been together for a little over half a year, he has been very distant, he says that he is not in a good place right now and wants some time to think about this. He felt like he wasn't enough to make me happy and that he failed as a boyfriend. 

On the other hand, his friend told me about a past relationship my boyfriend had with another girl for a while at the beginning of the last school year, he said that my boyfriend was with her for a while but then decided to just be friends so that he can be with me. So shortly, he left her for me. I don't know how to feel about that. 

I asked him a few times about it, and he never told me. His friend says that he was ashamed and didn't want to tell me in fear of me leaving him. 

We have talked it over many times now since we broke up (which was a few days ago) He says he regretted it the moment he left, he has been crying for days and doesn't know what to do. He feels ashamed for leaving me and wants to make it up to me. He is scared of failing again and hurting me but he wants to try harder to make it better, and he wants a second chance. 

My friends and family would kill me if I gave him a second chance, despite that I think if we wait a while and try to make it work it could end up being good again. 

But the fact he didn't tell me about that other girl before me still bugs me in the back of my head and it gives me so many doubts. If he can do it once how can I be sure he won't do it again?

Provide a brief overview of the text.
<bot>: Boyfriend and I broke up, his friend tells me about some relationship he had before me that I never knew about, but now he regrets breaking up with me and wants a second chance.