I used to have a crush on my friends boyfriend
Did you really have to? What were your intentions?
It's very simple. If my friend and her boyfriend broke up, I will pursue him.
I think that's reasonable. You don't want to break them up, but keeping the option open makes sense.
In the meantime I'm waiting to make friends with someone else who's as awesome as my other friend.
That's wonderful that you know your boundaries and respect your friend! I'm sure she would appreciate your integrity, and it's a smart move to distract yourself like that. Who knows, maybe this new friend would be even more than that and you can move on!