@aginglikeafinewine
also to ask. Should i have faked it? should i have pretended to enjoy it, im aware a few women do, but for me i think its a bit odd to pretend. Would that have made the relationship last?
No! It’s bad enough that you felt you had to do it to keep him quiet - coercion is actually a criminal offence.
But to then pretend you were into it would have destroyed your soul.
Sex can be the most beautiful and wonderful experience when both people want to please the other. If one of you is only in it for themselves it’s never going to be good.
FWIW I didn’t really want sex with my XH very often. It wasn’t even particularly that the sex was bad, it was good, but there was some festering resentment underlying the relationship that he’d never pulled his weight as a husband or a dad, so I just didn’t want to do it much.
One evening we were on a rare date night and I was thinking how nice it was that we’d gone out without the kids. He pulled the “if you don’t start having more sex I’ll have to find someone who will” line. I was totally blindsided.
We started spending a bit more time together in the daytime, going for bike rides together etc and I started feeling like it more often, to the point that maybe once a week I’d initiate it after we’d spent a bit of time doing something nice. Until at one point he said “we don’t have to do this EVERY time you know, it all just feels a bit contrived”. 
It seemed that whatever amount of sex he was getting it didn’t matter, almost as if it wasn’t about the sex, but about being able to moan at me about it! It all tailed off again and I accepted that maybe I just wasn’t a very sexual person and had just been doing it to please him. We divorced.
Met DP shortly afterwards and started having the most mind blowing sex ever, he really cares about me enjoying it, spends up to an hour solely making sure I’m having an amazing time before the attention turns to him. He takes pride in being able to please me, and the sex is never transactional - it’s not something he does TO me, it’s a shared mutual experience where we both spend time doing what the other enjoys. He won’t even accept a courtesy handy if I’m not in the mood as it “doesn’t feel right”.
So while that may all be TMI, my point is, don’t think that there’s anything wrong with you, as I did. It may be that you just have a lower libido, or it may be that you just don’t want it WITH HIM!
I’d be tempted to go with the open relationship route just to teach him a lesson. But honestly, he sounds awful and you’d be better off without him in so many ways 