Went on 2nd date, we've been speaking for 3 months everyday. While walking next to him I accidentally touched his hand & he smiled & looked down. Why?

When I accidentally knocked his hand with my hand while walking I said sorry and he very slightly smiled then looked down and we were still walking
I know this is our second date but the reason why I apologised is because of covid

Anyway why did he smile softly and look down?
Went on 2nd date, we've been speaking for 3 months everyday. While walking next to him I accidentally touched his hand & he smiled & looked down. Why?
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