I (26 f) am on a break with my bf (31m) and have to make a decision on whether I want to break up with him for good. 

We started talking two years ago when we met on a forum. In the first year we got along instantly and both suspected the other had feelings but didn't say anything until about three months in, when we agreed we wanted to cam, then meet irl, and pursue a relationship. Within that first year he made comments about his exes where he fondly gave me details of what he did with them sexually or how he felt about the nights/mornings or kisses he had with them, even going into non-sexual details about them. This has been the source of trouble in our relationship because what he said plays intrusively in my head and makes me feel hurt and resentful and I hate knowing all the things he told me. I know everyone has a sexual history but I don't want to know things to the point that I get intrusive images of him with others in the scenarios he described.

He said he didn't think I'd take it personally, the past is in the past and he's with me, exes are exes for a reason, we weren't together and they were in passing and not explicit. My thing is that if they're irrelevant then they shouldn't be brought up... Especially in a fond manner. Us not being officially together means nothing because we had intentions of being in a relationship. It's like being on a date when you're still getting to know them -- you don't talk about your exes. 

He hasn't made a comment since I told him to stop and he saw how big of a negative impact they had on me (about a year ago). Since almost a year of officially dating, our relationship progressed and we fell in love. He has told me and tried to show me that he loves me, wants a future with me, only wants and thinks  of me and doesn't want or think of his exes. 

But then the intrusive thoughts and images of his exes come in and the negative emotions of hurt, resentment, inadequacy, and disgust cause us to argue and make me hate him, push him away, and tell him to find someone else. He tells me he only wants me, loves me, and his feelings never wavered. We go through this cycle of the fighting phase I just mentioned to the honeymoon phase that's usually during and a little bit after spending time together irl. Everything feels so right when we're together and he thinks that if we close the distance things will be better and we won't fight as much. 

I don't know what to do. Is this situation beyond repair because of his comments that I can't seem to get over? Should I end this relationship?