Don't respond. Or tell her you'll talk with your lawyer about splitting things.
Let it go for today. Get away from the sitch. She knows she's pushing your buttons, don't let her know by reacting. I always tell my kids to step away and come back to it later.
Matt, step away and come back to it later. Go do something outside of the house and don't look at your W's texts or answer her phone calls.
Atsbaby M:36 H:35 T: 19 M:12 S:11 D:9 BD: 5/4/14 Proof of OW 8/13/14-love note from her 8/19 admits OW 8/22/14 files D w/o telling me 9/20/14 Says he wants to reconcile