Dude, there's no way around it, even if you do it as nice as its ever been done, she's gonna be crushed and her friends will hate you. The only thing you can do is to do it now, before she gets even more attached.
TRUST ME!!!!
I know this from experience, do not drag it out if you dont feel like you want to be with her!!!
PLEASE!
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Good friends tell you about the time they nailed that broad....BEST friends reach over, tag your hand, and say 'YOUR TURN'
The most unfair thing about life is the way it ends. I think the life cycle is all backwards. You should die first, get that out of the way, then go live in an old folks home, then you should get kicked out for being too healthy, go collect your pension, then on your first day at work you should get a gold watch. You work 40 years until you are young enough to enjoy your retirement, you go drinking and partying, then get ready for high school. You go to elementary school, become a kid, you play, you have no responsiblities, you become a little baby, you go back and spend your last 9 months floating around in a spa and then you finish up as an orgasm!