
I know how you feel. The same thing has caused a lot of resentment in the past for me in my relationship. Of course, now my bf is also eating healthier and dropping weight pretty quick, so the new resentment is that he loses weight faster than me ha! Just can't win.
Would he eat the same meals with you? Can you tell him that seeing him eat those things triggers cravings for you (if that's the case - not that he should have to hide his eating habits, because that's also an unhealthy thing to do?) Hopefully there's a way you can work this out with him to better both of you and make you less cranky and more willing to stick to your eating habits.