HUMMMMM. Sometimes the only reason I'm "trusting" of others is because I KNOW MYSELF to be trustworthy, and I have to take a risk regarding them as I would want/need someone to take a risk regarding me. Then, too, sometimes things do/will happen depending upon our expectations.
I've had too look long and hard at myself. And that was the scary part. Actually the older I get, the more I understand how humans do not always "hear" nor "see" what is right in front of us - thus any can be prone to jump to conclusions about another's motive. When MAYBE the truth of that person was obvious the whole time.
As for individuals who use and abuse others for sake of just that...I'm not responsible for them. And yes, there have been times when I suffered greatly over what I considered betrayel from "a loved one." That's the way it goes sometimes. It helped make me a better person in the end because I chose not to be like others I see.
It's as simple sometimes as "live and let live." I can still get pissed about harms done me in the past, but I'd rather take it as a learning lesson and move on. Maybe I'm speaking at of turn here, but what helps me is doing volunteer work. Ya know, instead of looking to get whatever I think I need, I "get", by giving. And I volunteer at a Christian based community center which helps me learn tolerance because I'm very anti-christianity. Life is just to grand...and full of paradox.