What do you guys think?

So recently this guy from high school (years ago) reached out to me, I left his dm on delivered for about a week because I wasn’t sure if I wanted to talk getting out of a relationship about 2 months ago. I kept thinking about him since so I liked one of his pictures and he messaged again. I finally started replying and he had said I was still bad from high school and we talked all day for 2 days straight and he was very flirty, then all the sudden he started being short and left me on delivered for days then today he finally opened my messages from our last convo but replayed all of them so I’d get the notification . But never replied , he still follows me on social media is he trying to play games ? I’m just confused what happened