I can't even imagine. I raised my kid 100% on my own. That is tough enough. I couldn't imagine allowing myself to depend on someone else, especially the other parent, and being let down consistently.
But - that said - I and many other single moms prove it can be done. But I must confess, it is so much easier without all the DRAMA!!
Sorry you are dealing with this. Sounds like you have a good plan though.
tlc