When our best friends aren't as close as they were

I have two best friends.they're dani and anda.we've been together since we're in junior high.we've been through many things in maintaining the friendship.i'm still close with dani,but anda seems more and more distant from us.she keeps saying that she's busy.she and i are living closer than dani.but dani is somewhat closer in spite of the distance separation.just several days ago i gave them two mobile cases,one for each.i asked dani to deliver the other to anda.i thought that the latter hadn't received it since she gave no news.but when i confirmed it to dani,she said that anda already received the case.so i sent her an sms,asking about it.surprisingly,she said yes.she gave me short thanks.

At that time and perhaps some other times ago,and now,i just realize that when we grow up and get older,many things change.at certain points,it hurts me that the friendship between my best friends and i aren't the same again.i know that we can't maintain it when it only goes on one way street