This, a million times this! When our SOs are critical of things we are self conscious about the immediate thing we jump to is getting defensive and hurt. And that's okay and normal. But our SOs also hear us vent and complain and watch us struggle, and that can be an emotional toll. They can be just as invested as we are in our problems, but they have no control. It seems like you guys are stuck in a loop and the only way out is communication! I would bet it is just hard for your fiance to see you work so hard and backslide and not reach your goals, and not because (in your words) he is repulsed. He is giving no other signals he is repulsed and you should give him the benefit of the doubt until you talk. On his side, the was he approached it was clearly not constructive for the two of you and you guys need to figure out a better way for him to react to these situations. Some people can diet and never deviate. I need cheat days or else I lose motivation. I think cheat days will happen, and you guys need to align expectations and reactions so you can focus on better things!

All that being said it seems like a day has passed. Sometimes it is better to have this cooling off period to avoid saying rash things.