Eighty percent of men have wondered, "Does she like me?" But when they confess with nothing but passion, all they get in return is a little card that says, "You're a good person."
"A good person" sounds like "Keep trying" or "You're a great guy; we should get to know each other better."
But the chances of succeeding the next time are almost zero. It doesn't mean "a really good person," but rather "someone who'll do, whoever they are."
Because she doesn't care, she feels nothing. So whatever happens is fine with her; it has nothing to do with her.
He warned himself, "Never assume she likes you."