So I'm in my mid 40s I shouldn't be asking advice for this! 
it's like being a teenage girl again!
Basically I have a 'friend/acquaintance/Facebook friend' who I know from childhood. I know his sister, used to go to school with her. He's a few years older than me. Typical Facebook likes etc, I've always quite liked him. He appears to be single, has a son who lives part time with him. I'm a single parent to a teenage boy.
He recently commented on a post of mine on Facebook. Then he was out on a night out on Saturday and messaged me regarding my post and sent me some videos of him and another person I know from years ago. They were tipsy and dancing and Just larking about. It was fun interacting as I was home alone.
Yesterday he messaged me again saying something funny about the other person and he had a video of him dancing and wishes I could see it am I on WhatsApp. He said he needed my mobile number to add me which I gave him, he added me and we started chatting. Nothing major just chit chat back and forth. It was nice. I haven't heard from him today but don't want to seem super keen if that isn't what he feels too? Should I casually message him again? Help! Feel pathetic lol!! As you can guess I'm not used to this and haven't had a relationship in years!!! 