Death of a Friendship?

So I've been thinking lately...Is it often that we have friendships that we hold on to simply because we were friends and not because we are friends? Maybe it's only me but it seems like some of my friendships from years ago might not even really exist anymore. I can't be the only one to feel this way?!?! My first instinct is to say, "Well, people grow apart, but you can stay friends, right?" and I believe that to be very possible and true. On the other hand, it's also possible that friends grow apart and one or both of them just don't really want to maintain the friendship anymore. While I think that's not always a bad thing, I guess I just wish people were more upfront and honest with their feelings. I find myself having to ask myself if I am friends with someone because their actions don't make me feel valued in any way. If I have to ask myself that, do I know the answer or is it too complex to know so easily?? I don't know if I will ever know these answers. I just know that right now, I feel like I have a lot of new friendships springing up all over, a few old ones coming back to life and one in particular that's dying slowly. I am saddened but I am also not convinced that this person is the same person I have known all these years, or that they even care about my friendship anymore. But I love them, so I don't walk away. Maybe I should though... Maybe I should let my friendship die a natural death...