When a guy taps you on the shoulder what does it mean/friendly or?

Anonymous
The guy I like who knows I like and we've been friends for two years came up behind me and he tapped me on the shoulder and walked away a sec innocently looking away or in front pretending it wasn't him lolll it was so cute. Later on, he did it again.

Friendly or something more?
When a guy taps you on the shoulder what does it mean/friendly or?
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