Male coworker, that I like, ignores me?

Hi everyone, So there's this guy that I work with that I really really like. I am 28 yo and he is 29. I have been working this job for 6 months and in those 6 months this guy never made any effort to talk to me and has never reached out to me on social media and so on. There is barely any interaction between us at work. However I noticed that he changes his behaviour in group settings, when drinking or having dinner with all the other colleagues I catch him staring at me and he even laughs at my jokes or says something after my jokes to make them more funny and keep the conversation going. I have no idea what to think about this behavior and don't know if he is just openly showing he is not interested or if he is just shy.

Male coworker, that I like, ignores me?
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