I'm going to be brutally honest here, and I'm very sorry first of all for the pain you are experiencing. But having just one male friend to rely on in life is creating a dependency for you that is not healthy whatsoever. You have got to branch out, my dear, and find new friendships somehow. This man is drowning in issues, and he's bringing you down with him. You are not happy, you are depressed, and your mental health is suffering because of this person. That is NOT healthy! Can you join some social groups or social interest groups, and learn how to make new friendships or at least make new acquaintances? You've got to find a way to meet other people, make new friendships and be far less dependent on the one single "friend" you have who is ruining your mental health!