You need a new boyfriend!. Please don't do this for him do it for you, he doesn't deserve you. What happens when he is fat and bald? are you gonna treat him like he has a disease? I don't think so. I get so pissed when I hear about men like that. I met my wife 20 years ago, I was very thin then (175) she was a 2-3X gal back then . I fell in love with her. I know it sounds corny but love is on the inside. We have been married 19 years as of last month. I now am a plus,plus size (not for long I hope) she never looked at me any differently when I put on 150 pounds over 20 years. She is in the approval process for Gastric bypass so we can take this journey together.
Please for your sake, find someone who loves you for who you are and don't settle for what you can get.