Angelina it is true that what our parents do is a form of blackmail, but the other way round we would also blackmail our parents.
No because there is no blackmail in the other direction. "I love you but I'm not a child and I'm not doing this anymore, it's damaging. I'm moving into a share house with my friends."
If he cuts off ties with you for that he's going to die a very lonely old man. You are his world. You said yourself he's got no-one else. That's a lot to give up! It might break him but it sounds like he needs it.