It's like the tidal changes or whatever.

I suppose it's the natural cycle of relationships. They grow and change as you grow and change. Sometimes it's a little difficult to accept the ways in which your relationships change. But you learn to just roll with it. Maybe this person will start to float away from you for a bit and you'll be a little sad or afraid. But there are some people you just know will always be in your life. So you let them float away a little bit, because you know the tide will eventually start to bring them back. It's just the way it happens.