I Forgave u but I can never trust you again

Yesterday I was pretty upset with one of my closest friend. What she did was undespicable and unforgivable. This is not the first time she did this to me but basically ever since the time i knew her. When I first knew her, before I actually met her in person, she has done the same thing with my ex boyfriend which our relationship at that point of time were already hit the bottom rock.
Last night, I was so hurt with what she did. My mind were racing all night asking to many questions. Questions like how could she? why did she? What did i do to her? Why me? She just had to do it, at the time I am breaking up with my boyfriend.
But again, after a long thought about it, I think even though she is one of the closest friend i have, she is just a bitter person or perhaps, she is just miserable and maybe just maybe..I am spacial after all.
Anger is a wasted emotion.
Too much energy, too much effort spent on a negative feeling that gets you no closer to being happy than the original catalyst that caused it. Many more worthwhile pursuits exist than to than to sit around seething in anger.
Anger at past happenings are better off being let go. The past cannot be changed, better to look toward the future. Anger at people can be distilled into two categories. People you care about and people you don't. The latter should simply be dismissed. Being mad at this person only serves to make you unhappy. It can never have a better resolution. Again just let it go. In the other case, it is much better to try and understand why the person did what was they did that made you mad. This is a much quicker path to resolution than fuming over what could be little more than a misunderstanding.
Living life, is about finding happiness. It really is just too short to waste precious time on being angry. There is too much to be done, and so little time to do it in.
To this friend of mine, its sad that even though you are one of my closest friend, the trust is no more there. I can never share my secrets not just my darkest secret but even the smallest secret.They said it takes years to build up trust in a person but it only takes seconds to lose trust in a person.
Things happen by decision, whether its right or not is secondary. We never know till we decide. I have made few major decisions in the past month or so.