Why is my old classmate (a guy) from hs snapping/ texting me after all this time?

It’s been 4 years since we last saw each other when I graduated. I mean some of our classmates we had in high school used to tease him that he must have had a crush on me because he would always tease me and talk to me. He did that with most people but especially me and this other girl Anna. What does he want exactly?

Why is my old classmate (a guy) from hs snapping/ texting me after all this time?
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