Prolactin levels fall quickly if you bottle-feed, but in nursing women they may remain high for 18 months or more. This may have certain evolutionary advantages, but it can be hell on relationships in the here and now. Anyone who's gone a while without a partner knows that humans have an innate need to be touched, and suffer horribly when deprived. Less discussed and less charming, we also may have an upper limit on how much touch we can stand, and new and nursing mothers get plenty, thanks. Not only are they constantly hugging, cuddling, and lugging another person about, they are literally giving 'til it hurts.
Babies are takers.
Rewarding as parenthood may be, it's mostly a one-way proposition up until the time they can start bringing you breakfast in bed. You two are only six months in and already about to gnaw your own legs off. You're going to have to do something. Ms. A., your man needs touching. Even if you go no farther, please hug him and curl up with him at night, at least until someone must get up yet again.