Unless you directly analyze someone's word(and they don't always give words) then you can only guess their thought by way of their actions. We tend to interpret people thoughts based on how we ourselves would act. I guess this causes a lot of consusion when dealing with other types.
I can right throught the crowd in order to talk to someone I'm interested. I pretty much put all of society at the mercy of the few people that matter to me. I guess I expect the same to be done for me. That may sound to some like a lot to ask for, but I repeat that it doesn't seem like too much to me because it's how much I give. It's merely an expectation of reciprocation.
About having feelings hurt... Last semester, a fellow student of mine made a point to form friendly relations with me. He was Extraverted to the extreme. He worked together a lot for the duration of the spring, and then when school ended for the summer, we parted ways. I never called him a single time between then and the start of this semester. He said he was expecting that I'd call him at least once. *shrug*
He struck me as more of a colleague than a long term friend. I guess Extraverts expect more indiscriminate cordiality from Introverts.