husband says "I guess" to anything sexual

This is really really starting to ware on me. We've been together 6 years, married 3 years, and for about 4 years - he went completely 180 and doesn't like sex anymore. Like, at all. He denies me when I try and make a move, doesn't see me as sexy when I put on lingerie, never tries to get me off - ever, anymore.. it's one done and sleep for him. I'm 23 weeks pregnant and hormones are screaming - I've never watched so much porn. We were both awakened early morning hours and I just had a pretty kinky dream. Ready and willing I said "I just had a dream and I'm feeling kinky.. wanna get some" ((mind you we haven't had sex in ohhh 4 months?)) He pretends not to hear me and makes me repeat it.. he says 'sure'. Goes to the bathroom and comes back - I whisper "can I go down on you" and he says "whatever, sure." ?!?! I laughed annoyingly said YES OR NO his response "I guess" Like WTF DUDE?!?!???? If he's trying to play it cool - he's not. He does nothing to turn me on or get me off at any time - pregnant or not. Either I'm too much for him or he has negative testosterone or he's got a fear of pleasuring women. At least we were sporadic when we were dating and he tried then. I think being deployed changed him entirely. I'm a roommate not a soulmate now. Ugh.