Don't worry, it's pretty common, and he's got plenty of weight. I had a male who refused for 5 months last winter--he went from 850 grams to 570 grams. He didn't really start to look flabby until March or April. Now he's back up to 1068 grams, and I'm letting him have seconds if he wants them, because I don't know what he'll do this winter.
I recommend continuing to offer food, but only doing it every other week or every third week, just to preserve your sanity.
And get him a girl! That pastel's a beaut.
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