Does repeated staring at work mean he’s interested if he never approaches?

I’ve been working at my job for a few months now, and I’ve noticed this guy who works in a different department. I barely see him, but whenever I do, I notice him staring at me.

if I’m walking down the hallway, he could be busy working on his computer or moving equipment and he’ll stop what he’s doing to watch me walk past.

One particular time, I was sitting in the break room, and he came in and stayed for a few minutes. I caught him looking at me four times within two minutes. We’d make eye contact, I’d look away, and then I’d look up again and catch him looking.

But I’m not sure if he’s actually interested because there was one time I walked up to him and asked him a question, and he answered so quietly I could barely hear him. Another time, we were alone in a room, and he didn’t look my way or say anything to me.

I’m wondering if I should approach him or just wait to see if he approaches me.
Does repeated staring at work mean he’s interested if he never approaches?
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