Should I ask him to move out?

My boyfriend and I have been together for 14 years and have a 3 yr old son. Things have been rocky between us since our son was born and now it's got to the point where I think the relationship may be beyond fixing. We never go out alone as we have no family near us and my boyfriend does not trust a babysitter to come into the house. We don't talk in the evenings, instead he normally goes on the computer and I watch tv or go on my laptop. We are rarely affectionate or intimate anymore and when I ask him why, he says he has given up trying because I have turned him down for sex in the past. He is often moody and angry and often speaks to me like I am a piece of dirt on his shoe. I have told him how this makes me feel, but it makes no difference. I think he is depressed, but he refuses to seek help. We have nearly split up a few times over the past year or so, but each time we agree to try to make things work and give it another go. It's then good for a couple of weeks, but soon goes back to normal. The house is mine (left to me by my mother when she died), so if we split it would be him that needs to go. He doesn't have anywhere to go though as he has no friends or family nearby. I want to make it work for the sake of my son, but we have been here so many times, I'm not sure what to do. From a selfish point of view I am also aware that I am in my mid-thirties now, life is too short to be unhappy and I really want another child before it's too late (obviously not with my partner if the situation stays like this). Please help - what should I do?