Can I be happy that my best friend has broken up?
What will you do with your friend now?
I want to be there in case he needs somebody to talk to.
Regardless of the circumstances, a breakup is a tough ordeal and you shouldn't be happy that your friend is going through it. Your friend may direct their negative emotions at you if they see you happy as a result of their suffering.
That's why I'm glad my friend is male, he's not very emotional when it comes to these things.
I understand you have a good friendship, but it's still not good to have wanted them to break up. If he finds out your joy in this, I think he wouldn't be so thrilled about it all.