Why is he acting really awkward around me?

Mel2021
For some context, the guy is in my team and last week at work we had an office Christmas party where we were talking and he seemed to be really keen to talk and tease me a bit last week at the party, but now this week has became distant and doesn’t seem like he wants to talk to me now.

I don’t know what I did wrong, why is he suddenly acting like this?
Why is he acting really awkward around me?
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