I complimented him and he left me on liked, what does that mean?

Okay so he's a pretty shy guy who doesn't talk much, but this week we started being a little more comfortable with each other. So I texted him that he has a pretty smile, he read it inna few seconds and just liked the message. Did he like it? Did I make him uncomfortable?

I complimented him and he left me on liked, what does that mean?
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