You recognize that your W's hostility doesn't have anything to do with you. Yet she's dumping it on you. Do you want this? Do you want to be on the receiving end of this? You don't have to be, and you shouldn't be. If she's stressed or upset or angry she can share this with you, but not take it out on you. It does affect you, regardless of whether it's because of you.

Leaving is not the only answer here. You can learn very valuable relationship negotiation skills here. Things will change as long as you are willing to.

“No problem can be solved from the same level of consciousness that created it. ”
– Albert Einstein