ugh, i slid 15lbs and I feel terrible. I know exactly how you feel I agree with whomever said that you need to set your "bad" weight gain (not flux, actual fat) and when you hit that realise that you need to change.

Things I use to tell myself I can't gain? Skin elasticity (i read somewhere that with weight gain/loss it depleats..if I'm wrong I don't want to know ). I Buy EXPENSIVE clothing, there is no way I'm buying another pair of jeans because my butt doesn't fit into the expensive ones. I also try on my clothing regularly to make sure I haven't shifted back into the fat pants.

Also, I do sympathize with your SO and the weight thing. My SO can eat a lot, and drop weight twice as quickly. Bastard