Try not to worry about her breakdown. Do you like her hurting, no, but do not carry that burden. It is her burden to carry.
She's right. It all hurts so much, but that's up to choices and decisions made. People have to lie in the beds they make and it is not your responsibility to fix it for them.
I understand being empathetic to it as it is painful, but only to a point can you show feelings without it negatively impacting you. You do not need that pain / burden / etc. as you've got enough going on.
It does NOT make you any less of a man or husband or partner to not worry. It's about protecting yourself.
All the best.
Me 42, Wife 39; Married 16; Together 17; Kids: D13, S10 Wife asks for Divorce: 03/19/13 Reconcile: 07/07/13 Round 2 Starts: 02/19/17 Apartment Life: 04/21/17 PA Confirmed: 05/23/17