why people lie ...why they are unfaithful !!!

[Iman]

why people lie ...why they are unfaithful 
despite the fact your good 
 And you open your heart and mind to listen
you are ready to give all what you have 
is it because why you always make others  ....special
 Or  they just caught you out of guard!! 
what is that ''blind pure sense of belonging to people''
is it lack of experience in life? do we have to pile up bad experiences to learn or we have to do what is right?
can't get that out of my mind and I'm kinda lost ...any advice!!