You need to be the H only a fool would leave. In other words, yes, you should continue to do the things that a loving spouse would do for their partner. Just watch that she doesn't take advantage of you. It's not like you have to do every last thing she asks, no matter how inconvenient. If there is an affair, you change this up a bit... you don't bake her cakes.

And you shouldn't be afraid to ask her to do things for you and the household... You're married and live together! She's able to help out. Since you haven't been asking for anything, start small.

Do you really need to discuss custody details at this time? I'm thinking probably not, and that nothing good can come from it.

M: A really long time.
Crisis: 5 years.
She's still worth it.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose. -Viktor Frankl