Why does my boyfriend want ?

I'm in a relationship with a great guy that and I really want things to work. I can't get my head around why he watches though. We have great (or at least I think we do) and while I'd like more he doesn't 'refuel' for at least 12 hours so more isn't possible. He tells me he only wants me and that he doesn't know why he watches . WTF how can you not know why you do it?! He won't tell me what he likes to watch either, he says its just standard - what's that? Why is he not satisfied with me? It really hurts to think that he wants to watch other girls behaving like that. He says thats not how he wants me to behave but why does he want to watch it if it's not how he actually wants ? Alot of the time he's watching it in the bed we sleep in together, either just before or just after texting me goodnight and saying he wishes I was there (we only see each other at weekends cos of uni & work). How the hell am I supposed to feel? Please help me it's driving me mad and it's ruined relationships I've been in before. Please none of those 'watch it with him' answers cos that'd be just as degrading - he'd be horny from watching s not thanks to my presence.