Is it normal for a guy to openly talk about jacking off?

Livy
A guy that I've been talking to for over a month now over social media & text message (we met irl, but continue to talk long distance) has recently started telling me about when he's masturbating. Is this normal? Does he expect me to send him nudes (bc i won't)? Does this mean he likes me, or is just comfortable around me like a friend?
(note: he did not say that he was jacking off to me, he was just making sure i knew he was doing it; also, we are both 16)