Check with a lawyer but if your name is on it you don’t want to get defaulted so i would pay it until then. Most cases the home will be sold and divided unless you can pay him out.

Know the feeling, my ex has stopped paying our personal loan and now they are harassing me for all the money, I’m only paying half, not my problem when he has his share to pay, work it out with a debt collection agency, they are really good if you are honest with them about the details. Good luck

Is the mortgage in both names.? As you are both liable for it.

I’d say get advice from your solicitor. You don’t want to lose your house, and your ex has legal obligations.