Kassie...I probably cannot be much help, but you and I are in similar situations. My STBXRAH left (because I demanded him to) in January. He will not cooperate AT ALL. We have no children together (our second marriage for us both); only marital assets. I am the one who supported him and his family and my son for almost 8 years. Put him through school and he is dragging me through the court system because he wants maintenance. My male friends scratch their collective heads on this one...
Because it was clear he was not going to cooperate, I had to lawyer-up as did he. I think to keep your clarity and sanity-you may consider doing the same. I don't like having to pay for the counsel, however it is the best money spent at this time-so that I don't have to be the one trying to get him to at least respond in a timely fashion.
Hang in there...