My husband also has the effects of a prostate removed with nerves cut and his drive is almost gone. I can tell you that we have filled our lives with many friends, family, golfing, movies and just being happy to be alive. I know the adjustment to the lack of sex can be difficult but the thought of losing him is much worse. Lupron and the fear of recur PC is enough to take the drive out of anyone. We spend much time holding hands and cuddling and when he is out of sorts I must be patient because I know how worried he is even if he doesn't say so. We do not live as 'borther and sister or as my father" because I still treat him as the man whom I can lean on and I respond to him warmly but he knows that no matter what having him alive is more important to me than sex so it is not an issue with us. I must tell you I am 15 years younger than him so I have wonderful memories of before PC and still have a wonderful life with him now.
I know it is so difficult and I really wish you well and please don't take the lack of drive personally.