Guys, What does it mean if a guy keeps sending smiley faces?

I met this really sweet guy on an app where you can make friends with people from all around the world and after almost everything I post he says something nice and ends it with a smiley face. This is the first time I've encountered something like this.. I'm a little confused to be honest
Guys, What does it mean if a guy keeps sending smiley faces?
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