How can I be with him again?

There this guy slightly younger than me and we were on a trip. I noticed he kept dozing off and I thought it was cute so when he mentioned not being able to find a comfortable position I said he could lay on my shoulder – and to my surprise he did.
I can’t describe the feeling I had when he did. I blushed very hard and my whole face heated up. I subtly laid my head on top of his head a little to hint that I liked it.
After some time he put his head back up. We were close for the rest of that day but the next day he wasn’t that close for some reason (he didn’t make an effort to be around). Then the trip ended.
I still think about that moment to this day though two weeks later. I really want to do it with him again but he doesn’t really respond to texts and I remember him saying his life is a mess rn. What should I do?
How can I be with him again?
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