DEAR ABBY: I am a high school sophomore who is usually pretty happy. I have amazing friends and a great family, and I make good grades. I have liked "Michael" for three years, and recently he has begun to show more of an interest in me. He's polite to everyone, but my friends have noticed he pays more attention to me than to anyone else.
Well, two months ago Michael suddenly started dating another girl. They're totally addicted to each other, and I'm crushed. I am also confused, because when she isn't around, Michael flirts with me again. I try to avoid him and not flirt back, but it seems to keep happening. I never would have expected this from such a sweet guy. What should I do?