I'm not going to take my friends side and live with his ex
What is the reason why you do not want to take your friend's side?
I just want them to be honest with one another on their intentions.
It is good to be loyal to your friends and be on their side. But you have the right not to take you friend's side if they are not honest with you. It is okay to stand up to what you believe in.
I wish I could punch him in the face.
Just because it is your friend does not mean that you have to agree with them. Sometimes the best friends are the ones who are not afraid to be honest with you. This honesty allows you to understand when you may be wrong in your judgement.