It would be interesting to see how this demise in sex happened though. I agree that the OP shouldn’t stay in a sexless relationship if libidos are so vastly different, but how did it happen that they went from two/three times a week to never? If for instance the OP was saying that she didn’t feel it was frequent enough at three times a week even though the sex itself was great that still wouldn’t have exactly made him feel positive about himself or that she wanted him for sex rather than anything else.
If however they were happily muddling along at two/three times a week and he suddenly stopped having sex with her without explanation other than that he was tired, then there is obviously a different issue at play here. Iyswim. Also, if he was e.g. happy to give her other attention but didn’t want penetrative sex himself would that be ok? Or is it possible that when he does things with her she tells him how she wants him in other ways, making him feel as if what he is doing isn’t good enough?
And just to lay my own cards on the table here, I am on the other side of this in my own relationship but for medical reasons. I don’t want any kind of penetrative sex for any reason at the moment, and no, I wouldn’t blame my DP if he decided that he couldn’t stay in a relationship with me at the moment. However, I am happy to satisfy him in other ways, but that’s just not good enough, and he then spends that time telling me what he’d rather be doing with me instead. And the result of that is that whereas I would have remained affectionate and giving otherwise, I no longer feel inclined to do so because that appears to come with expectation.
It’s not DP’s fault. We had an active sex life previously, But I cannot give him what he wants currently for various reasons. But it’s led to a distance between us which otherwise wouldn’t have been there, even though we’ve had conversations about it.