Why would this guy I kinda like tell me happy birthday with a few emojis when we haven’t talked through snapchat ever since we added each other?

the last time we talked was in person about a month ago. i got the vibe he’s a nice guy and he mighttt be interested but i really don’t know.
Why would this guy I kinda like tell me happy birthday with a few emojis when we haven’t talked through snapchat ever since we added each other?
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