Did his ex break him?

I've been seeing this guy for a few months now and we've talked about commitment and past relationships.

He told me he got cheated on during his last relationship and that he felt unhappy in the relationship. He said that his ex cheated on him with his best friend. He's never been in relationships after that and he told me that he wants everything to be perfect (yet nothing ever is, right?) He told me he has this pain inside of him and he can't get rid of it. He also said that he trusted me but I could tell that it was hard for him to talk about this. I tried to cheer him up etc... but I don't really what to do next... I'm glad he opened up to me.

What is your advice?
Did his ex break him?
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