Transexual porn + a bad sex life PLEASE HELP

So my boyfriend has always had a problem with porn... I found out about it about a year ago and saw that he was watching mainly just "shemale" (not meaning to be insensitive I just don't know what to call it) porn. I don't know why but it bothers me SO much. he mainly watches a transsexual with another man. It makes me feel like he might be gay. He says it's just a fantasy, but he has had sex with 1 man in his life before (says he hated it and it traumatized him but would maybe try it again one day only if he was single). I wouldn't have such a problem with it if it wasn't affecting our sex life as well... I have a super high sex drive and we only have sex like 2-3 times a week. I almost always have to initiate and he only acts like he's super into it like half the time.. the other half I feel like he just has sex with me so I won't be mad/sad.. he never eats me out or try's to make things exciting even though I give him tons of ideas and am open to trying anything (even watching that kind of porn with him. He says he's too embarrassed) I don't know what to do about this.. I'm super insecure. We've talked about it so many times but it never gets resolved. Do I just let this relationship go and find someone else?? PS. We've been together 3 years. I'm only 19 and he's 21.