It sounds like you're trying to guess what your wife intends, without feeling like you really know what she is planning.

I don't think you are getting anywhere by thinking in terms of "saving the marriage." It sounds like there is this third "entity," almost like a third person - The Marriage. A marriage isn't like an historical landmark that has some intrinsic claim on being preserved. Your wife isn't wanting to be with you, while you seem to want to be with her. If you have little grasp of why she is exiting the relationship, then that right there suggests you've not been real tuned in to her. I'm not saying you've been inattentive. Maybe you were making assumptions about things. Notice: that seems to be what you are trying to do now - "Should I just assume she has left me?"

Maybe it's time to put aside all assumptions and ask yourself what you actually know. At one time, your wife wanted to be with you. Presumably, that's why she married you. Something happened. Nothing about this is random. Maybe there's been a financial setback. There came to be an issue between the two of you, and it's gotten so bad that she left. Maybe she met a man who presented her with a better offer. But she wouldn't be open to that, unless something was already wrong at home. Maybe one of you developed a health problem. Something specific is driving this. Get a fix on that, and you'll be better able to discern her intentions.

You don't have to tell us here. But get real with yourself. Something has been going on in your home that led to this. You must have some idea what because you live there.

Speaking as a woman, it's been my experience that men have a tendency to hope that they can make things be alright by insisting they have no idea what could possibly be wrong. Nothing pisses a woman off more than that.

I'm sorry for the pain you are going through. It might help you to talk a bit about what brought you and your wife to this juncture.