Just be friends. But never get yourself into a situation where you have to say to her "I just want to be friends", because that will be the end of your friendship.
She seems like a pretty cool person so someone you ought to stay friends with. And who knows, maybe one day she'll slim down and she could turn into the girl of your dreams.
I do know this though, the more you get to know (and like) someone, the less significant their physical appearance becomes.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix







