You don't have to be friends with your ex!
It is better to be in good terms but actively building and nurturing a friendship is a whole different story.
You owe him nothing.
Did you try to see him again and noticed that it put you down emotionally?
Conclusion? You are happier when he is not around.
It's okay to put yourself first and respond to what you need.
You don't need to prove anything to anyone.
Take your full life and freedom back.
They are yours and belong to you only!
You are the one who decides what to do with them.
Remember that many people decide to go for "no contact" after breaking up.
This is precisely to give them time to rebuild a life without their ex.
Once your life is totally rebuilt and you have 100% of your power back, seeing him again might feel totally easy.
In the meantime, I would encourage you to be firm and engage only in what empowers you.
To your power!