How do you keep a guy at work interested?

I get along well with a guy at work. I've been in my job for nearly a year.

We chat everyday and the other day was his first time he asked me to hang out outside of work.

How do I show him I'm interested? I don't know if he's into me or not as he doesn't show any signs.

Eg: Another girl at work has her work crush and they're always hanging out, messaging in teams and he buys her coffee etc.

The guy I like doesn't do anything

Thank you

How do you keep a guy at work interested?
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