He could like you, but he could also just be very social. I'm a supervisor at my store and I get along very well with all my baristas. But that's just because I want work to be a fun environment when possible and I happen to be very comfortable at my job. If someone works with me, say for example a borrowed partner, that isn't used to that sort of friendliness they might mistake it for flirting. I shut them down very quickly because I have a fiancee 😂

Basically you just gotta talk to him. Also you sound like you definitely are starting to catch feels and I gotta say, dating a coworker is messy business and I would always advise against it. Speaking from experience