Does it mean anything when a guy keeps telling me hello?

There’s this guy at work who always says hello to me many times a day. Especially when we are in a group or a big meeting. He says hi to me in front of everyone and it draws attention cause everyone looks over at me even when he’s already told me hello earlier that day. He won’t do this to anyone else. Every time he passes by me he says hello and I pass by him several times a day.

Does it mean anything when a guy keeps telling me hello?
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