BTW, the new book of Schnarch is about sex and intimacy in long term relationships. He says that having low desire in a LTR is NORMAL, as it should be. And he says the way to change that is to "stretch" beyond the comfort zone, adding new tricks (lol, my translation of his words, ha ha) and focusing on intimacy...
I think reading it would make you feel better. It's great how he explains how it is apsolutely normal and right to hit low desire periods. K