Yes, you will have to file a response to the petition, but have you thought about speaking with your attorney about working with you to come up with a plan to stall the D proceeding otherwise? I would hope they could help you come up with a plan to do what you legally have to but do things that would maybe delay things and that wouldn't come across as retaliatory.
If you're like me, I just never want to give up hope. I've heard of couples who even got back together after an A and divorce. I, too, am trying my best to wait out my spouse'a A. I will add you to my prayer list and would ask that you add me to yours.