Needing outside opinion on this man

He's a jerk! I suspect that he has some personal issues if he's such a good friend, and can have sex with you, but doesn't want to date you, because it seems like he's ashamed of you for whatever reason. Don't let it make you feel bad. He's just a stupid piece of shit!

If you feel like this has something to do with you're being "chubby" don't let that bother you, because there are guys who actually prefer bigger girls. If for whatever reason you feel unhappy about your weight, and physique then certainly feel free do adjust your diet, and exercise accordingly, but whatever you do please move onward, and away from this jerk who seems to think you're good enough to fuck, but not good enough date. So please if you ever get yourself unchubby don't go with this guy, because if he can't accept you now as you are so he's certainly worthy of another fitter version of you.

This guy is just an asshole! Forget about him.