<human>: I have been dating my bf for 1 1/2 years now. I come from a conservative background and have had mixed feelings on porn in general, but he comes from a very open-minded home and it has led to disagreements.
 
Ultimately we agreed on tolerance and I accepted it was his "me time", and I was more important when it came to the real thing. That is just how our relationship works, not saying it's best for everyone.
I asked him one day if I could look up someone on IMDB on his laptop and he said okay, and then I pulled up his internet (which he had left open) and all his tabs were searches for porn of his ex-gf. I felt very hurt and betrayed (especially because this was the night before I left for a 5 month, out-of-state internship).

She was his high school girlfriend whom he dated longer than me at this point. She is much hotter than me and I know she fulfilled him better, so my self-esteem wasn't terribly high before this incident.

I confronted him about his searches and he claimed one of his friends told him there were videos up and to search for them. He said he wanted to see them to feel better about himself and she means nothing to him. IMO, she must mean something to that little head.

I left for my internship the next day, still seething, and the issue was never resolved fully. How can I bring it back up again without sounding like a bitter bitch? I really want to understand and to solve the issue, but I want to let the past stay in the past as well.

Can you summarize the given text in a few sentences?
<bot>: I caught my boyfriend looking up porn of his ex-gf, and the issue was never resolved. How can I bring it back up and solve it?