No regular sex?

I love my boyfriend with all my heart and there's no doubt that I know he loves me..However, for the past three years since I've been with my boyfriend, We've never regularly had a sex life, It's all mixed up, I'm lucky when I get It. The last time we had sex was four months ago, I'm thinking It's going to turn into six months or even more. It's happened before. I've only ever been sexually active with him, when ever I try to bring It up that we never have sex, he claims I'm guilt tripping him and making him feel bad until I drop the conversation. And I just end up crying because I think I'm dirty for wanting to make love to him when he doesn't want It. He even gives me the. "I have a head ache, my back hurts." And that would all be understandable If he actually meant It. I know for a fact he watches porn often and sometimes daily, I've seen his history and hell..Even caught him. When I confronted him about It, again, he says I'm making him feel bad. So I haven't said anything since then. And I've even started to just turn to porn to get off, then end up feeling unsatisfied and depressed because I could be having sex with him but he doesn't want It. I haven't asked him in months and It doesn't seem like he wants to, because he hasn't asked me either or tried to touch me. He doesn't even look at me naked..I just feel extremely depressed and I know he loves me but I think he just isn't sexually attrached to me..like at all. Anyways, Any kind advice would be helpful. Sorry for the long post.