Should I dm him?

I met a guy yesterday at a friends house. We were there to see a fireworks show and we really hit it off. We talked for a couple of hours, he came there with a young girl about 10 years younger then him because she was the one who was invited to the party and she brought him. He just moved to my area 2 months ago from the other side of the country and this girl is the daughter of a family he has known his entire life and they are pretty much the only people he knows here so I don’t think there is anything going on between them. It turns out he only lives a few blocks from me as well. On my way home I added him on Instagram and by the time I got home he had accepted and requested me too. Should I send him a quick “It was nice to meet you” DM? I haven’t dated anyone in a few years so I’m a bit rusty. (Not that I think I’m dating this guy) lol I just met him lastnight, I just don’t want to seem desperate but I really did have a nice time meeting him. Ugh HELP