It’s your choice to act like a husband. Her reactions to you not acting like one are on her. So you have the choice to act like a husband or not. She can act like you are her husband all she wants. How you respond to that is on you.
We can’t count on karma coming in the way you want. Karma may come in many years down the line in a way that doesn’t give you he retribution you want. You have to trust in the universe. And your desire to see her pay is really only affecting you, not her.
It’s a cruel world, yes. But you want who you want in the way you want by your side . But it’s someone who doesn’t want to be. So learn how to guide yourself through it. It’s not easy, but you can’t depend on someone else for it.
You really do have a sense of entitlement to things being just as you want them. I’m guessing you got what you wanted , when you wanted and how you wanted it growing up? It’s just not now how adulthood works. And heck, most childhoods. I understand this heartbreaking and life changing, but you can’t control every pickle to happen the way you want. You need a plan for yourself with what you have