Why doesn't he want ?

I am 7 mo pregnant with our son. My partner does not seem the least bit interested in talking to or spending time with me. Let alone making love! NO matter how subtle or blunt I am in trying to initiate it, even if I back off for a few days or weeks, he hardly so much as touches me anymore. It seems all he wants to do is tinker in the garage. We haven't even had an intimate conversation in months. I know he is stressed about the baby, money, etc., but so am I! I'm the one CARRYING the baby! To me, anyway, is a total stress reliever, and after a 10-hour day in my office/commuting, all I want to do is collapse into his arms. But it seems he feels the opposite-that after his day at work, he just wants me to leave him alone! I am always competing with something-his hobbies, the TV, whatever, and I am afraid of looking desperate for his attention. But I really need him more than ever right now, as I prepare to give birth to his child. Help me!!!