Core answer
A proposal to examine
Trust is confidence in the other person's basic intention to be happy and to contribute to happiness, not blind confidence in every action. Intention and competence are different; a person may mean well and still lack the ability to fulfil that intention. Trusting intention while accurately evaluating competence makes relationships both humane and practical.
ReflectionRecall one disappointment and separate what it showed about intention from what it showed about competence.