How Can I Get a Girl to Lose Weight?

BostonChris
I recently met this girl that is absolutely everything I ever wanted in a girl. She accepts me for me and is the most understanding person I ever met. She is falling for me fast and has expressed this to me, but there is one problem. She is overweight. I don't want to sound shallow or nething but I have always dated beautiful women and I need them to be of certain weight for me to find them sexually attracted, otherwise it won't work. I met her in High School couple years ago and she was drop dead gorgeous but college has been rough on her and she gained not only gained the freshman 15 but the freshman 50. So she wants to go to the gym with me and lose weight but I'm afraid she'll want to be in a relationship soon but I can't because I need her to lose some weight first. I don't know how to approach this situation and I know I sound like a really shallow guy, but I need to be physically attracted to a person in order for it to work. What should I say to her or what should I do? How should I approach this?
How Can I Get a Girl to Lose Weight?
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