If she did it on purpose just to annoy you, then you could get an even hotter boyfriend or pretend that you don't care at all. You could also turn all your friends against her, or tell your crush all sorts of bad things about her without seeming too obvious about it.
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It's not a good idea to steal your best friend's crush. If she/he is your best friend you wouldn't let anyone come between that. Crushes/bf's/gf's/ ruin friendships. So second guess that idea.
I've done it before, and it did not turn out well. Both of us liked the same girl, and i was trying to win her over. Now because i did that every1 makes fun of me becuz i like her, so expect if you do that the same will happen to you.
Well, one has to keep in mind that your 'crush' might have wanted to go with the other person willingly. Doubt the 'crush' was forced to go out with someone else.
Also, one person doesn't 'own' the other ... you might want to ask your 'crush' if you have done something wrong that might be bothering her/him.
It's important to communicate your feelings with both your crush and the person who may have taken them. Try to understand what happened and if there was any miscommunication. If your crush chooses someone else, it's essential to respect their decision and focus on your own well-being.