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More interesting is a guy with tense, shaky, cringing body language who also congruently says "Jesus, I'm so nervous talking to you right now I can barely think straight." That can be cute!
Trust is more fundamental than predictability as such, IMO: what is it that I trust this person to do or not do? E.g. maintain social decorum, not touch me without consent, etc. You can trust and signal trust while still having lots of other kinds of unpredictability around.
And indeed people actively cultivate the cool kind of unpredictability. If you can predict literally everything I'm going to say why bother even talking to me?
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