Most Helpful Girl
It depends on the girl. I am more attracted to stockier, solid guys, not "fat" guys or skinny guys. That doesn't mean I wouldn't date somebody with a bit of chub or a skinny guy, but I have my preferences. I don't think (by the sounds of what your girlfriends said) that your weight was the issue in your relationship. If people love and accept you as you are and told you so, then it's unlikely that you being skinnier would have made the relationships work - and if it did, it would have been for superficial reasons, not genuine ones.
If you're concerned about your weight you could work on it, but you should do it out of your own desire for your health. If you're happy at your weight, then screw anyone who has an issue. Just do you.