Help.

I have been with my other half for 9 years and have a 2 year old child with. Lately he has been acting wired with me. He never wants to talk about our relationship and haven't had sex since June. I try and tell him how I've been feeling he gets annoyed and walks away when I ask him whats up he response with saying idk I'm lost and stop talking about it your making me mad. Ladies what do you think about this and what should I do? Does he not want to be with me or is he tired of me or what? Please help.