How easily do you trust people?

I used to. I used to trust most anyone unless I had a really good reason not to. The last few years have come with so many knife wounds to the back that I find myself unwilling to let anyone know anything anymore. The worst part, the ones who have done the worst were the closest.

I'm not sure if it is worth human interacion outside of work. I wouldn't even post this if it weren't fairly anonymous.