My bff that's a girl broke up with her bf and I'm not sure if I should ask her out or not. We are best friends! Her bf resentfully broke up, so should I wait a while? Or just not ask?

Unfortunately your BFF is on the rebound here  which is a gray area here so the best thing you can do here is just be her friend and listen to her and things will work out if it's meant to be. But delay the relationship attempt for now and youll be glad you did, so just be patient and her friend. Trust me here and good luck