Guys and their ego !!

Im not being sexiest with the title..
Read a post in Vonne's blog about the story betwwen a guy and his girlfriend..
It's seriously dam touching and sad.........
Read it and you will know why..
Reading it makes me comes up with few unanswered questions..

Why do guys always insist on doing stuff that he knows will hurt their other person feelings(or maybe he really don't?)?
Is saving your face really that important ??
What's up with hurting the girl another time when you know you had hurt her once??

These questions are not from my past experience or im being bitter aite?
hehe...
im just curious.....

Not all guys are erm being not so nice..
But some of it are and im just curious to know why they are being like that..........