if the stress is too much, you don't have to involve yourself with her other than your child. Only you can decide how much is enough for you.
If you can't take it and pull back, she will respond. Whether or not it saves the marriage or brings it to the head on divorce is unknown. Or you keep going as is.
Sorry things are so tough right now.
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.