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

Ok. So recently it came to my attention that my (21F) boyfriend (21M) would prefer to have an open relationship. We've been dating about 3 1/2 years. I was a virgin when we got together, he was not. We waited 8 months to have sex. I'd say he's definitely more adventurous than I am. He has expressed interest in trying threesomes, which I've turned down. We've done anal once upon his request. He feels I'm not interested in it but I've told him if he buys some lube I'm down to try it again. 

I think the fact that he PREFERS an open relationship is important here. He says that while that's what he would prefer, he is ok with continuing to be exclusive sexually. He says that if it came down to either breaking up and being with other people, or staying together and only having sex with me the rest of his life, he'd choose the latter. He says there haven't been any specific people he's wanted to sleep with, just the general idea of restricting sex to one person doesn't make sense to him. 

I have a strong aversion to open relationships. I find no fault in them, they just aren't something I'd be ok with. I have absolutely zero interest in being with anyone but my boyfriend. We both feel that our sex life is being affected by the fact that he isn't able to have sex with other people, though he hasn't said that he thinks those effects are negative. 

I'm not really sure what I'm looking for here. Maybe just some insight from anyone else in this situation. Can this difference in preference ruin our relationship? How do I get over this feeling that I'm not enough for him? He's done nothing wrong and I know he loves me. I'm just trying to wrap my head around this. It's got me feeling pretty confused.
<bot>: Boyfriend wants an open relationship but says he's fine with not having one. I am sort of hurt that he wants other people.