He doesn't want sex. HELP?!

My s/o has gradually got less and less inclined to have sex or anything remotely physical.
It's been 2 months and we've had sex twice... It's killing me. 
We had 4 months of me being away so obviously there was a dry patch then but it feels like he just hasn't really been horny since. 
He says that he doesn't like how he looks at the moment and that he'll be happier when he loses some weight but I never thought that could so significantly affect his libido?
Am I being pushy or insensitive? 
Does anyone have any ideas on how to get the romance back into the bedroom?

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