I found something that might make you understand me a bit better

This is exactly what I tried to do with THAT girl. I tried to tell her to be a better person, i tried to give her chances , to trust her. But then she lied and ruined the chances. And i got mad/sad (depending on the situation) at her for not believing me that she can't just treat people this way, but then i realized 'why should i do this??' because she had treated my like a piece of crap..