If you’re going to have kids, there’s only one way to go. They have to know they’re the most important things in your life, and once you’re doing that, there’s no way that you could not learn from them, because they just give you stuff constantly.Danny DeVito
A simple metric for making a determination: marriages need love, trust, honor, respect and desire. The people in them also need to embody the adjective forms of those words: lovable, trustworthy, honorable, respectable and desirable. If one of the persons stops being those things, or stops working to be those things, the marriage will suffer.