relationship problems

My boyfriend and I have a problem and I think it is lack of intimacy. Since I got pregnant I haven't been in the mood to do anything at all... my boyfriend doesn't have a job or go to school, but for me, I wake up every morning for school at 5 am, then afterwards I go straight to work and get home at 10:00 pm. By then, I am so exhausted I don't want to have sex I just want to pass out. But the thing is, if I don't have sex with him or give him head, he won't show me any love at all. When we first found out I was pregnant, he would rub my belly and he would tell me how much he loves me and our child, and he would cuddle me when I fell asleep and kiss me often. But now he won't do that. He is just cold towards me. He will cook me dinner. But he won't hold me or kiss me or cuddle me anymore. All he talks about is getting sex or head. I just don't have the energy.