When you wait for something and dont get it

It feels like its been forever since I heard from him..Yeah actually 3 weeks and a little more. Just wondering whats up ?? Did I do something I dont know about? or has something happened??? I just hope he wont stop writing. He did promise he wouldnt. Just very worried at this point :(  Want my letter , just to know everything is okay. Stupid mail for makin me wait!! -.- UGH