I think the currency of trust is when you sense the other person cares as much about you as they do about themselves. Here are some simple generic questions to evaluate where you stand:
How's it going?
How is what I am doing for you helping or not helping you?
What could I do better?
Where else do you need help?
Did what I do provide value for yourselves and if so, how?
“People don’t buy what you do; they buy why you do it. And what you do simply proves what you believe.”