I have a crush on my friend's boyfriend.
Have you told your friend about this?
No, but I do want to steal my crush from him.
I know you can't help who you have feelings for, but you shouldn't try to sabotage someone's relationship. It's selfish to try to steal you friend's boyfriend just because you have feelings for them. You would be hurting both of them by trying to end their relationship.
I want to get into a relationship with my crush so I'm going to tell my friend no matter what. Aaaaaaah!!!
I'm sure you will see other people that you are attracted to other than your friend's boyfriend. Try to get Tinder or other dating apps and look for other people that you will find attractive and boyfriend-material.