You have a purpose. A reason for being here.
I can't tell you what that reason is, but I can tell you what it is not.
It is not so you can self-sacrifice so someone else can fight his demons.
It is ok if you want to help. It is completely understandable.
Who wouldn't want to help someone they love?
But it is not ok for you to lose your health, happiness or yourself in the process.
Loving someone is not worth losing your livelihood.
I know you love him. I know he is hurting. And you think if you love him enough, it will stop his pain. He will change.
Unfortunately, love alone can't conquer all of his demons. Not if you are the only one fighting.
When you find yourself giving up your happiness to make someone else happy; if you find that you are losing yourself in helping someone find himself; it is time to make a decision.
You will feel like it is a selfish decision. But taking care of yourself is not selfish, it is necessary.
Sometimes, it is best to let go and realize you can't save him.
He has to save himself.