Is he keeping cool after the first date?

So I went on a date with a guy from a dating app.

It went great from my opinion. We chatted all night for hours. He paid for dinner and said that I pay next time. 2 days later, he texted me saying he is thinking about hiking with me and I replied, "I will probably be free next week".

He didn't follow up with me when that next week came by. I didn't contact him either because I prefer to play it coy.

I saw him again online on the dating app.


Is he not that interested or he is playing it cool?

He's possibly just thinking about things, possibly dating others.

It's hard to say. Either you hear from him or you don't.
Your expression of "I'll probably be free next week" is a pretty strong indicator that you're open to things.