perseverating on what you might have done wrong without realizing it? par for the course, i would think.
emails, especially. i know people are busy, and i forget to reply to people myself. but unanswered emails drive me crazy. i've determined when people are actually upset or offended by you, they don't generally tell you so. so not hearing from someone could mean you did something "obvious" that was off-putting (and you're meant to figure it out yourself, or the person resists saying it out of "politeness") or it could mean nothing. it's enough to make anyone go mad. (anyone who can't figure out the intentions of others, that is, which is us.)
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Now a penguin may look very strange in a living room, but a living room looks very strange to a penguin.