Quite simply you both acted like donkeys and neither of you will ever grow up. YOU sir were a deadbeat. You did not pay the court ordered support and got nailed for contempt. You apparently did not take her back for contempt. Both of you need to really grow up and start acting like adults. What a shame your children witness this mess.
Parents should remember 3 things: Love your kids more than you hate your ex; when you have children the relationship with the other parent is until death; your children determine what type of nursing home you end up in.
Nothing stated by me should be taken as giving you legal advice or forming an attorney/client relationship.
Attorney-GAL in Ohio.
I've removed the knife from my back, polished it, and will one day return it -- long after you think I have forgotten.