A friend will only stand in your way when you are on your way down.

....

I feel you may need to stand in your own way, as your continued
commitment to him is poisoning your health.
Let him know you are there for him, while he is willing to keep the
relationship >mutual< and healthy, but you need to be healthy for him and you insist
he be healthy for you... if not, you are doing the rest of the world a disservice
by denying it your 'good' YOU have to offer by him
weakening your greatest potential.

SW