I have a friend like that who I helped but has moved on, is doing her own thing. I think the other person has reasons of their own that we don't/can't know, it's not about us. That we don't care if they lie or owe us money, etc., they do care, even if we just enjoy being with them; if they don't enjoy themselves enough, they can't very easily be with other people they feel they are in their debt to in some way or that know something about them they wish weren't true.