That's a really good point. Yes I think trust does take time to build in the relationship for both T and client.
I do actually recall saying "you can trust me" to my T I relation to his hesitance to tell me when he was thinking a certain type of therapy might be useful to me, but was concerned about suggesting it before he was sure.
Thanks for posting this. I think a lot about whether or not I trust my T, so it's good to be reminded that it's a two way street.