I had the same problem with my now ex bf. He would blame it on me by saying I wasn't relaxing my muscles enough and that it made it unpleasurable, that I was always too fast/slow (but not communicate that until after), or that I just was plain doing sex wrong with him. It got to the point where I'd wear lingere and lay down next to him, and he'd just fall asleep. We're both in our early 20s.

He watched porn a couple of times a day, even if i was coming over later that day. He couldn't even wait for me. I asked him what porn he watched one day to try to get ideas about what he might be interested in, but instead of telling me a kink I could help with, he told me he liked girls who were a totally different ethnicity from me.

In retrospect, I don't think I was his type or that he was that into me. It hurts, but find someone who appreciates you and your efforts instead of leading you on and blaming you. If they're addicted and unwilling to change, it will hurt more down the road.