WTF is sexting.....

Met a guy in a bi-indians sub(I am a guy), told me he was 16, and started "sexting" as he said.Asked for a photo of mine which I did not send, he then threw a tantrum over it, calling me a cheater(We have known for 3 days), he also kinda turned out to be a PDfile(he was 21, I don't know if that classifies as PDfilia). I was kinda desperate to talk to someone, so I continued to talk to him for a few days until yesterday.