For me Angela, it is because I know about MLC, that there is something "wrong" with W. The behavioral changes, her whole personality shift, the stranger.
And knowing what I do of her upbringing, the s3xual abuse, lack of validation, etc, etc, all makes "sense" when put into the context of MLC/mental health issues.
They didn't "choose" this bad wiring that has now short-circuited.
People have mental and physical health issues. You don't just toss them to the side of the road. The people who do not understand you and what you are doing, would look down upon someone divorcing their spouse because they developed a debilitating health condition, or a dis-figuring accident, I would imagine. Or a "recognized" mental health issue such as clinical depression, etc.
You have to give them time to recover, work through it, to heal. That's what those vows were all about. Not abandoning your mate because of something temporary (hopefully), or small, petty.
There may be a time when, yes, you have to let them go, but those vows meant you try, give them some time, the benefit of the doubt, for a while.
Imo, our "easy button", instant gratification society and culture have engendered a "Oh, my W is broke, I'll get a new one! There, problem fixed, what game is on TV tonight?" attitude. Not doing deep water trolling there...
Hope that made some sense, need more coffee...
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm