First, Give him a week or two off in between offering food. When my female starts refusing, I just let her go for a couple of weeks before offering again. Usually she picks up again, after that.
Second, what are you offering? My female was eating small rats on a regular basis and suddenly she decided she wanted large mice. Go figure!. Sometimes getting offering her fresh killed, rather than f/t gets her attention too.
Third, as long as he isn't losing weight, don't worry to much.
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2.9.9 Leopard Geckos
1.2.3 African Fat-tails
0.1 Gonisaurus Luii
1.1 Central American Banded Geckos
0.1 Gargoyle Gecko
1.1 Calabar Pythons
1.1 Savu Pythons
1.1 Cornsnakes
0.1.2 Chondropythons
0.1 Standing's Day Gecko
1.0 Frog-eyed Gecko
1.1 Ball Pythons