<human>: Summarize the given text in a few sentences.

For most of our relationship, we have spent every night together, with a few exceptions. This week, he worked late and I was at a presentation but we text and he facetimed me to say goodnight. 
Last night, I went to his house while he was still at work and was going to clean up some clothes. Usually, I would put a tv show that he had on his computer on and go to work. When I woke his computer, I accidentally hit space and a video of him and an ex popped up. I closed it, but it was a bit late considering what it opened as, and I can't get it out of my mind. He had opened it the night that I was late in class, either before or after the FaceTime. I went home, he came over and apologized. He also mentioned that it was a girl that was a hookup and only for 1-2 months(I imagine it was the latter, but no idea how long it lasted there)

I'm pissed and hurt and want to forgive him but I'm not sure how. This is the first time where I've felt like I didn't want to have sex with him, and I know o want to move past this but I need help to not dwell on this and get the mental image of him on another girl and a girl on him out of my mind.

Recently, I've been a bit bummed that our sex life has declined. From 4 or more times a week to around 1 or 2. When he apologized he said that it was because he was embarrassed he orgasmed so quickly. I mentioned that I would rather get laid quickly than not at all.

This coupled with the sex tape just really hurts and I want to move past it because I really do love this guy, even though I'm probably more mad at him than I've ever been at someone before.

I also just feel weird about having sex with him right now.
<bot>: Boyfriend watched sex tape of him and his ex on a day I wasn't able to see him, during a dry spell. Hurt, how can I work towards forgiving him?