You know what you should do? If in case he is a lil over weight, then bring his ass in the gym whenever you go, and make him loose those extra pounds and make him look like a sexy bitch! lol. Maybe the guy IF he's a lil over weight knows he is and want to change it but have no motivation yet to change, having you around , pushing him a lil can be his motivation. But, maybe he's just playing with you a lil too, maybe he's actualy buff or something and just putting you on another track so when you'd meet, you've be like "oh my, yum! " . hehe. But, when you think about it, if, he's not boyfriend material in your book, then he can still be a really great friend, right?. So you shouldn't loose totally.
Anyways, let us know how it goes.
Good luck.