How do I stop my best friend from getting back with his ex girlfriend so we can have a gay relationship?

Get real. He is interested in girls and is not going to turn gay for you so accept it and look for guys who are interested in some guy on guy fun. People have ended up on prison for life because they let their jealousy get to them and murdered their rival.

Time to grow up and accept he is never going to be gay for you. There is a sexy gay boy for you and all you have to do is find him. One in 10 boys is heavily bisexual or gay so start looking for the ones that are cute and wanting to have a gay lover.

you shouldn't that's manipulative. He needs to live his life and you need to live yours. you both deserve that much.

You can't if he is still interested in her, you cannot control other people and their thoughts and desires. Have to accept that.

If he is not gay, leave him alone.

You don't.

If he is your best friend you won't try to stop him. If you stop him, you are not his best friend you are a jealous lover.

I'd tell you to shove it up your @$$, but apparently that's what you like

Ask him if he wants it , if not then walk away .