Originally Posted by Ustwo

Sounds like someone has a cross to bear here. If saying something stupid about your SO's appearance were as horrible as you seem to think it is, my guess is there would be very few people out there with SO's. My wife got semi-fat for a while, lost much of it, got pregnant and now is trying to get back into shape (and is just about there). There were times when I pointed it out to her, and sometimes in a not-nice way if she were eating things she knew she shouldn’t. Guess what, we are still quite happy together and will have been together 15 years in exactly one month.

Part of a successful long term relationship is having a thick skin at times. Your SO just may say something hurtful, stupid, shallow, mean, etc, and rather than flying off half-cocked and extrapolating it to worst case scenarios try to gain a sense of perspective and decide if its worth ending a relationship over something petty.