People.. show there true sides

Ok.. so what is it with People.. how are all nice to you.. and then in the blink of an eye turn .

Heres my little example.


The last two days i was sick for work so i called in .. never before have i called in .. plus i have helped out and covered many many shifts for them.. NOW that i miss to shifts they treat me like dirt... I will never understand why and how people act like that .. and can change so fast over nothing.