What does it mean when a guy coworker checks on you?

I have a male coworker who seems attracted to me and he regularly notices things about me eg when he’s my rostered day off and I sometimes work online, he’ll message me to ask why I’m working etc.. like he checks on me kind of concerned, but in a considerate way.

No other coworkers do that other than my boss and he doesn’t really do that. So why would this guy even bother? Does it mean anything?

What does it mean when a guy coworker checks on you?
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