My ex was TOTALLY different when we met. When we were together, she turned into a slutty b1tch who just wanted to mooch off my kindness.
What a mistake that was.
@ Kitty, true, it can go either way, but there are more girls than guys, so its mostly towards girls.
Some guys will do this, I know a couple of guys who have only gone out with a girl to "get some" and leave her.