I think you're absolutely right. People have to earn our trust. What we do with our T's is slowly build up trust with them. Same with other people - give them small areas of trust, like, "meet me at Starbucks at 2:00" and if they keep showing up late or not at all, you know that you can't trust them with that.

Only give your deepest trust to those who have earned it. Do not give your trust unconditionally. And I think we can 'trust' or 'not trust' but maybe there are certain things we can trust a person with but not other things.