I've tried to analyze exactly how I feel, but it really is just like I'm performing a trick to entertain the other person. I do feel satisfaction in seeing the signs of their emotional dependency developing, but once that's set, it's just done for me.

I'm relieved to hear that you have experienced something not entirely unlike my situation, even if you feel differently about it. Oh man, I could go the rest of my life without sex, too. In fact, I'd love it if I could manage that. That's the same with my partner - there's the "up" after sex, unless I haven't managed to act interested enough. Then I just hear complaints. If there's too long a period between sessions, my partner also starts withholding casual physical affection like cuddling, hugs, and such - even positive feedback - all supposedly unintentionally. This, of course, does not make me feel like forcing myself.

Right, exactly. The depth of my affection and bond with my partner doesn't fluctuate on my side with regard to physicality, but it does on my partner's side. Now the "maybe I should date other people" comments have started. Sometimes I feel like banging my head against the wall, because I cannot STAND being threatened. And I feel incredibly threatened - and cheapened. It's like the relationship doesn't mean anything at all, even after all these years. When it comes up, I want to scream, "GO, THEN! *insert expletives and hostile, alienating comments here*" I mean, the feelings just surge and rage, and it's all I can do to NOT spit them out, although there have been times when they have come out. Thankfully one of those times was to a friend.

I just...I can't even explain my feelings coherently. It seems like the only way to express what I'm feeling is to scream. Not very helpful, I know.