I don't know what trust is Fuzzy.

I barely trust myself. I like the expression "trust, but verify." I think that is reasonable.
Forgiveness for people who hurt us long ago... I forgive them as best I'm able so that I do not continue to let them hurt me TODAY. If I am still entangled in the past emotionally then I'm not living and enjoying my life today, as best I can. Just because you forgive does not mean you have to have a relationship with that person.