Feeling unloved

Laura
Lately my other half has been a bit distant with me. Usually he wants sex a lot but he don't seem to be interested much. When it comes to bed time he finds something to get out of having sex with me, wether it's playing a game on his phone or he just happens to remember he needs to do something on his computer. It gets me down, I feel like I'm not good enough and ugly. 
I stood completely naked in front of him and he just walked past me. It upset me :-( what can I do?