Rabbi A Miller Z”L use to say stay married and continue (Of course not fighting but continue together he would quip.) He had very harsh words to say about divorce just because you can’t get along. Now I don’t know what he would say about mental illness or CVS any top of abuse. And nothing is a cardinal rule. From the tone of your question though, it sounds like it isn’t extreme to the point of abuse. Rabbi A Miller ZL is the torah way.
By the way most of our holocaust grandparents were not that compatible and many fought. But they knew you need to tough it out and hold it together.