Sounds to me like your grasping for straws as far as reasons to break them up. He's a year older, he's gained weight, he is still in school, he doesn't go out of town with you two, ect. ect.

Fact is those should be non-issues for you. Not to mention they sound petty at best. Obviously she doesn't mind them enough for it to be an issue between them, so why should you?

I realize you have feelings for her, but the fact remains, she's still your friend's girlfriend. So be a friend to both of them and stay out of it. If he is mistreating her, she will realize it sooner or later. If you treat her good and with respect she will realize that too. So who's to say what will happen down the road. But you making a move and breaking them up is the wrong answer.

Ever think that she might just think you were a jerk for ruining her relationship with him??? Just a thought.

If he's beating on her or being abusive that's a different story, but doesn't sound like you have anything other than your own emotions as a reason for them not to be together.

In my humble opinion.