"good bye"

I often say "bye bye " at any time when I finished my phone call. It is usually for me. I have a good remember about the feeling when I say "good bye" At the primary school I has studied at 6 primary years. That day me and my friends was cry because our teacher has resign. It is very bad for me. A teacher who is teaching, training, and consulting to me but tomorow I can't see her. However I think I should keep a good memory in my mind forever and intend to study with other teachers.