Friendship is in degrees, and one have to learn how to put everyone in their place. Some people are just for greeting, when you see and when you don't see them... It's till when next you see. Some are to be checked up on once in a while and some are the closest. You can't put everyone in this last stage, it can lead to frustration.
Also, humans have their own opinion as to how they treat friendship, and also they are bound to disappoint, so the fact that you treat someone with top priority doesn't mean you should expect totally the same from them, although the way they prioritise you has to be of a reasonable sense too, but expecting the same from will only break your heart from time to time