He probably got your name and number from a phone book, or online tracking app. Try not to be scared. It would scare me too, but they have all the time in the world to seek out people who will give them something, either shock and dismay, which feeds their egos, or someone to "sext" with.

Oh, i meant to say, he probably has no clue who you are. He's just looking for people's names like cold calls, just to see who might react at all.