Don't kill yourself over a boy, he'll bring another girl to your funeral. - this may be the MOST inspirational & truest advice I've ever seen for young girls who think it's the end of the world when a boy dumps her-
I've always thought about relationships this way. If I can't see myself with this person for the rest of my life, I'm not wasting any more time than I need to with them. Simple as that. I have far more important things to worry about right now.