My introverted ass spends at least 6 hours a year for the last decade wondering if I should install a Customer Relationship Management program to use on my friends.

I mirror other people, always have. If they are happy to see me, I'm happy to see them. But if they don't call, I don't call. If we are both introverts we collectively decide that the other person thinks we're a toad and nobody likes us. If it weren't for the "Extrovert who collects introverts" trope I'd probably have no friends at all (or at least, prior to volunteering). There are a bunch of people I only ever see when we both show up at a third person's house or event.