Be patient.
First of all, don’t care too much about him. Even if he treats you like this, don’t care too much about his emotions. If you can be influenced by him, you still hope that he will treat you as a friend.
Secondly, do your part well. If you do your own thing well, even if one day you can't help it anymore and explode, no one will blame you for being ignorant.
Finally, people like him will be known in society.
Assume he does not exist and live your own life.