I didn't mean to suggest you were.
That's because you're not an introvert.
I am partly joking here, but also very serious about how an introvert would respond to the events you described. An introvert might like you and even look forward to the time you planned to get together, but then something comes up on your end and you call the introvert and say, "Sorry, I have to postpone." The introvert will make sympathetic noises, express concern for whatever came up, say they're disappointed, but as soon as you hang up the phone, they'll sigh in relief. Their feelings and words will be sincere, but they'll still be relieved at not having to get together (most of the time, and assuming they're more than just mildly introverted).