That’s debatable Tom Byers. To learn and grow it’s, necessary to not be selective with memories. Life, as you know, because you are wise, is full of ups and downs, positives and negatives (if we care to label them as such). Contrast helps us recognize what we want. It’s healthy to not fool yourself into imagining someone you grew apart from is still right for you (if they aren’t).
We can still recall the good times too. They were real and helped make us who we are today. You’ve taken the information out of context, somewhat, by trying to imagine what it would be like if you split from your wife. The way you feel about her, no doubt, would be colored by a gradual breakdown in your relationship, if it were to happen. You can’t know what that’s like unless it occurs. (I hope it never will, of course!)