I am probably going to come across as a needy teenage girl, and I feel like one, only I'm in my mid 30's.
I am bipolar, so not the easiest person to live with. Although my medication prevents the worst episodes, I still get some pretty intense ups and downs. Each time I have an episode I feel as though this pushes DP further away, yet the stress of knowing that DP is growing less affectionate and more distant is really stressing me out, which doesn't help my bipolar at all. 
In fact, I'm a bit of a mess at the moment. I wake DP up at night because he is a stupidly light sleeper, and as a result I end up on the sofa as I'm smaller than him. This means that we lose out on 'intimate time'. I've also noticed that his hugs which used to be awesome are no half-arsed and that he doesn't seem bothered about sex like he used to be.
I'm probably mostly to blame. He is a lovely bloke and everyone who knows him thinks he's great. I, on the other hand, am I more of an aquired taste. I feel as though he is too good for me. He is more likeable than me, a nicer person and saner than I am!
I feel as though he is just giong through the motions, of course, this could just be me feeling a little paranoid and the bipolar could be speaking, but I'm not stupid, or that mad at the moment!
It's not as though I ever hid this condition, I was completely honest as soon as we started seeing each other.