People will always disappoint you, they will never meet all of your expectations. But, remember that you don’t meet everyone’s expectations either, you also make mistakes.
I’m learning to be a less judgmental person. I’m learning to not assume that a person will act a certain way or has acted a certain way based on the little information that I have. I said before to not trust, but this doesn’t mean expect the worst either. Give people the benefit of the doubt, but also allow them to work for your trust.