What's the best way to break up with someone because they're fat?

[burninmylight]

OP, I was in a very similar relationship a few years ago. Met a girl online, had no idea she would be as big as she really was when we decided to meet in person after a few weeks, tried to give it a shot to see how it would work instead of immediately blowing her off, couldn't bring myself to take her seriously. After a while, I decided to be honest about my feelings and tell her that I wanted her to get regular exercise with me and let me help her with her diet, otherwise I couldn't get serious about her. We'd go through cycles where she'd try for a little while, then just give up and blame it on one thing or another, like a bad knee keeping her from exercise or some crap about needing ___ amount of caffeine every day for her body not to go into shock. I told her that her problem is self discipline, not anything body related. Even though I ultimately broke up with her, she later thanked me for showing her some personal changes that she needed to make in order to live healthier and find a meaningful relationship with someone else who could be more tolerant of her fat.

It's not easy to find someone you click with in terms of chemistry, but knowing what your body and mind is telling you in terms of your attraction to her doesn't make you a jerk. If she truly wants to take the relationship serious, she (both of you, really) must be willing to make sacrifices. A relationship is all about making sacrifices. There's probably no way to tell her without hurting her feelings a little bit, but what you're doing now will only hurt the both of your more in the long run. Tell her that you would like for her to start making positive changes in her life that will benefit her long-term health and that you're willing to do whatever it takes to make it happen. Set reachable goals along the way. Help her to get into a routine. Ask if there is any change that she would like to see from you so it doesn't feel like she's the only one putting in so much work and effort.

If she's unwilling to make those kind of sacrifices, tell her that you enjoyed the time you spent, but it's ultimately not going to work for you. You'd have nothing to feel guilty about after that.