Wonder why some people can be real hypocrites

Been wondering why some people can just betray their long term friendship and let it go just like that? In a matter of time, the person himself did not realise his very own mistakes here. He's too involved in his own imaginary world. Hurt the other party's feelings...and acted like an innocent party....haizzz....got nothing to say on this anymore....I'm glad my dearie is now doing well in his new job...living his normal to normal down to earth life...I don't mind dear...That's all what I ask for initially. He's starting his school soon and I'm very supportive of it. May he do well and achieve that dream of his...