It is like a marriage. You will fall in and out of love from time to time but you stay devoted to them. You will have periods where you don't talk much, or talk enough. You will lose yourself, you will lose touch. But true friends don't drift away during those lulls. In true friendships you let resentments melt, and find ways to show kindness, you help each other find your path again. Most importantly, you make a time and space to hang out with them for the purpose of simply hanging out with them.