I've delt with the same issues. I was too trusting for too long and got burned in too many situations because of it. My policy now is earn my trust. I take people on an individual basis. I guess it kinda works like this. When I first meet you, you start at zero. From there, your actions determine your place on the scale. Now, I'm not saying I actually have a scale written out or memorized for people, just saying that to blindly mistrust is just as bad as to blindly trust.

I can sympathize being very hurt by someone you've invested a lot of trust into. One of my best friends, or so I thought, betrayed me in an unforgivable way and I haven't talked to him since. There's nothing wrong with feeling angry or violated because someone broke your trust, infact I'd recommend it. If you don't get angry when your trust is violated, you'll set yourself up in the position for it to happen all over again.

I know how ya feel, and I know there's not much I can say to weaken the blow. Hope you feel better.