We're dealing with two different issues here. 1).Financial support/saving your credit rating; and 2) divorce. One doesn't necessarily follow the other. I say, cut the phone, repo the truck and be done with it. 1900 minutes of Cell time? Unbelievable.
Anyway, after you do the deeds, then, you can figure out whether divorce is an option. But unless you have deep pockets, why are you supporting him, and why are you believing anything he says?