Just because he brings home sweets doesn't mean you have to have them. Yes the temptation is more, but you can over come it. Hide his things in the pantry in a special section just fo rhim. Or in an area of the freezer you aren't likely to hit them

When he offers you food, or brings home something for you, just be polite and firmly say "Thank you for htinking of me hun, but I really can't eat that." If he persists or pushes ask him directly why he isn't supporting you. He may not relize what he's doing makes you feel bad. He might also not know anyway to show you he cares besides bringing home a treat. If it's the case of soemthing sweet that was ment to be romantic, tell him no thanks, but maybe you can do soemthing like a long walk together, or he should pick up a movie next time. Give him actuall suggestions to follow. Some people do need instructions spelled out for them, I know I do at times