Should I leave him alone?

Should I leave him alone and just smile from a distance. A guy I’ve liked and have been talking with briefly at work- works in a different department and when we saw each other, I could sense a lot of chemistry. He seems shy, an his father is in hospital from COVID so he seemed, in his own head. I’d been talking to him and my coworker told me just give my number to him already. Well, I did 4 days ago and he still hasn’t texted. I know he’s going through a lot and maybe I’m not seeing a hint, but should I just leave him alone? I’d still smile & say morning, but I won’t approach him anymore to chat. I can’t tell if he’s just wanting me to leave him alone or he’s not interested anymore. .
Should I leave him alone?
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