I'm going to hook up with a girl my friend wanted to hook up with.
Why would you want to ruin the friendship?
She is prettier than my friend and I want to win.
It is wrong to compete for the same person your friend is interested in. You could hurt your friends feelings and ruin the friendship.
Wow, you're so naive. I don't care about her feelings.
Then why are you friends at all? Do you even like that girl?