Ignore all the resentful teenagers who don't know you at all and are just shocked at the idea that love could ever be fleeting. If you've thought about it and talked it over and you still truly think what you did was right, then it probably was. (EDIT: Although if you're
already having second thoughts...)
Now stop boasting about how much she likes you <_<
EDIT:
The girl generally finds her rebound before the guy does.
Er, I hate to spoil your words of encouragement, but I can't say I've seen that. Generally the person who did the dumping finds their rebound first, regardless of gender...