You could argue that if the average golfer plays a golf course with 430-yard par 4s and they always miss the green, that's good practice. It's definitely great practice to play a course that's too long for you.
It takes a lot of experience of life to see why some relationships last and others do not. But we do not have to wait for a crisis to get an idea of the future of a particular relationship. Our behavior in little every incidents tells us a great deal.

