I am the reason he suffers
What is the reason for the suffering?
Repression, I think.
If you are with someone who is driven to cause hurt for someone else, it may be because you dislike yourself. Get help for your issues so that you don't hurt anyone else.
It's called freedom. I'm free to make people suffer.
You cannot blame freedom for suffering. Everyone suffers to some degree that is part of the struggle of life. Making people suffer on purpose is nasty and wrong.