Just knowing each other, and knowing the other was there. Responsibilities, bad habits, distractions. It's so easy to drift away, to become half strangers. That can't ever happen. We have to put in an effort.
Nothing just happens - except decay.
Everything worth having has to be worked at, to be built up, or preserved, or allowed to grow. And then when you put in the effort, it seems so hard. You remember how easy it was, and wonder why you bother. Because without the effort there's nothing. So we need to keep talking.