what's the deal?

I'm just going to get right into it. I feel like my dh just isn't into me sexually anymore. I feel like he's distant and even though he's there he's just not there. I've tried to talk to him and ask him what's going on and he says nothing. But you know that feeling you get in your gut?  We don't have a very active sex life and will go months without it. We blame it on work, kids, stress,being tired. But even though when it does happen we usually just connect.