Our relationships - whether they are familial, romantic or friendship based - all evolve, I think. Our life is like a bus journey (not the gross, humid, overcrowded commuting kind but the "just right" kind) and we are the driver of the bus. Some people get on the bus, stand near the back and get off quickly, some people get on the bus and stand for a very long time near the front and sometimes people get on the bus and act as our co-pilot... and there are people in between. And while people are on the bus, sometimes they move around, changing positions - looking for the right spot. Every relationship gives us something wonderful but people come and go... the wonderful thing about the bus is that it is always traveling and always picking up new people as others exit.
I think when we are young, our bus travels an urban route where there are always new people coming and going - people constantly shifting positions - usually for a short time. But we also have those passengers who get on our urban route, take a seat somewhere on the bus and continue on with us as our route changes - maybe moving toward the driver or getting comfortable at the back. As we age, we change our routes - moving from fast-paced urban routes to longer with less stops suburban or even rural routes. On these routes, we pick up less passengers but they stay on the bus longer.
And, of course, sometimes - usually related to romance - we pick up the wrong passengers. You know, the ones who are can be malicious, rude, obnoxious, want to shove of us off the seat and drive it themselves or downright violent but who, hopefully, we have the sense to slam on those brakes and toss them off the bus - whether there is a designated stop or not. A little snag in the route but the journey will continue on...