Not OP, but for me it was the level of fitness. Before we dated he worked out regularly. I told him that was attractive, that I like men who care about themselves, and that if he ever changed we were over. We dated. About a month in I noticed he wasn't devoting time to the gym, I mentioned it, and he told me it was because of all the time he was now spending with me. I reminded him about my conditions for a relationship, that I expected him to maintain his body, and sorry honey but your excuse is a load of shit. 2 months and 20lbs later I dumped him. He got super butt hurt and made sure to go to the gym when he knew I would be there (after work/during yoga class/etc.) so that I would see him. Didn't convince me to take him back, there was a dozen other reasons I dumped him. People always say it's the women that maintain their bodies until they get a ring on it and then let it go to shit, but guys do the same fucking thing.