Guy approached me but didn’t ask for my number, is he just not interested anymore?

So a guy who id seen before on a trail came up to me today to chat. He had been looking at me with interest and I looked back a few times. Anyway, we had a short conversation where he asked me about myself but at the end he just told me his name and asked mine, shook my hand and left.. not sure if he’s just not interested just from the convo? I didn’t think I said anything that would show I wasn’t interested but could that be the case?

Guy approached me but didn’t ask for my number, is he just not interested anymore?
Post Opinion