What should I do?????

He likes you. The end. If your best friend dated him, I'd stay away. That never goes well. Been there done that. /: If he used your best friend to get to you, then he obviously doesn't have the confidence or decency that you might be looking for. If you do like him, I'd give it some time before the break up blows over. Talk to you friend about it and see how she feels. You wouldn't want a stupid boy breaking up your friendship. It's never worth it. Good luck!