I resent my best friend
What is causing you to resent your best friend?
We can't agree upon something important
You should not be resenting your friends, especially your best friends. Your not going to always agree on everything and arguments are going to happen, however you want to try your best and make things up with your friends.
I can do what I want.
All I'm saying is that you should never resent your friend over an argument. You two need to make up and just move on.