I'm 22, I've been with my boyfriend 5 years and I can't come.

I love my boyfriend but when we got together I was 17 and he was 24 and I just wanted to impress him and make him think he was great so I faked it. 2 or 3 years later I told him and he went crazy and broke up with me. I told him I'd just said it to make him angry and he took me back. Now nearl 6 years later I finally told him. We've been having problems because he wants sex all the time and I just don't care about it. I masturbate alone a lot when he's busy but im just sick of him pounding away at me and me having to pretend I enjoy it. Anyway. Now he's broken up with me again (for lying) and I just don't know what's wrong with me. We have sex a lot although more recently since I've had my coil fitted it has slowed down a bit but still at least 3 or 4 days a week. But I just can't be bothered. Why can't I come after all these years of trying? It's ruined my life.