why...

why is forgeting so easy for other people in a relationship when they too might have invested in it specially if the relationship have lasted this long?
why is it easier for other people to treat others for granted when they say or claimed that they truly loved that person?
why is it easier for other people to hurt the ones that they supposedly loved?
why is it that they expect it that it would not be hard on you?
why is it that they expect you to easily move on and forget them too when we are all but only human?
how i wish that there's a button that i can push to turn off all these pain, a switch that i can pull to make it stop hurting so...