You've got a very kind friend. You've found him/her as a trustworthy person, that you almost absolutely trust him/her. You consider everything's alright and nothing's wrong, until one day you realize that he/she is about to betraying you. And I bet you must have known how does it feel.
Being betrayed by a person whom we really have trusted, it hurts a lot. I swear, for sake of God, I feel it much hurt, to be betrayed and disappointed. I can't stand betrayal and I do not tolerate it somehow. How can a person really waste a credibility we've given for him/her? That sounds harsh. I really hate that situation and I (myself) find out that it's hard to forgive a betrayal. Perhaps, being betrayed and disappointed too much makes me such trauma to trust, even know anyone else.
My Uncle Walter told me to not absolutely trust someone, since the human being has changed and will always change, either to positive movement or negative movement. And since I'm a new collegian now, my uncle told me to always be careful of people's traits. My elder sister strengthen my uncle's advice. She said that today, it's hard to find such trustworthy people. I've known about that. Even I can count by fingers how many persons whom I can really trust. The rest are not. I've been trauma since the last betrayal, and that makes me afraid. Afraid to trust anyone else, even to know new people.
This is kinda pathetic. I know that.