I'm thinking something in the way of "Yes." That's it.

WHEN she asks "why", I will simply say..."Because I think it is the appropriate thing for me to do given our current circumstances."

If she pursues further, then I will simply say "I don't wish to talk about this right now", and remove myself from the situation.

Me: 39y/o male
Wife: 35y/o
1 daughter, 2y/o