Why can people be two faced?

I just read something from somewhere..
I cannot say I am sure, but it sounds like that person is talking about me.

He said I was after her for looks?? Really, I am not tat kind. If I was, would i even get tgt with MN in the first place?

I dun wan to say so much, but it really saddens me. why as a "brother" cant you feel happy for me?? I really didnt know you are like tat, then why dun I say the same thing about you?? About you falling for a girl after just the first and second time seeing her?? Its the same isnt it?? You say I am a monster, then why aren't you??

I never ever said I wanted to be with her, all I want is to stay as her friend. Isnt that something you understand the most?? to be friends with her???

It took me so long to find someone, someone that is my "perfect one"...and to be called a monster by my own brother...why??why??