How would you feel if the opposite sex started treating you differently after you drastically changed your appearance?

I know a guy who went from being very overweight to extremely lean, cut, and athletic. When he got better looking he also started dressing better. The change was so dramatic he was barely recognizable after.

A girl he had been interested in for a long time finally slept with him after the weight loss. If you were in this guy’s position, would you feel resentful toward the girl for being superficial, or satisfied to have finally gotten your way? Was the girl being superficial?