my best friend is going out with my crush what do i do do i wait to go out with him or what?

Answer 1

you could wait to see how he will treat her...and just see what happens....

Answer 2

did your best friend know you liked him? because then it might be good idea to get a new best friend.
it's probably not a good idea to pursue him after your friend get done with him, that would cause issues between you and your friend.
my solution: if your best friend didn't know he was your crush, find a new crush. you'll get over it.