Why is my girlfriend doing this(10 points)?

I suppose you could say she feels that because of your appearance she was with you for you and not a six pack. Plus, chubby guys are awesome. They give softer hugs. I don't really know what else to say about the roll , except that maybe she's found you much hotter then her last boyfriends, and maybe she's become a bit of a chubby chaser. Or maybe, plain and simple, she just likes you, and thinks you like it when she appreciates your chub. And your not fat, your just chubby. Unless you carry it badly, then you just look fat. Either way, your girlfriend likes it, so you're fine.