Is it okay to tell a guy you were attracted to this?

I guess he’s not really interested and we work next door to eachother… sometimes he’s warm.. sometimes cold or shy… I can’t really read him.. he seems a tad more open to my other female coworker who looks… ehh.. I feel a bit rejected

I was going to tell him that he didn’t have to feel obligated to say anything to me the next time he says “hi”…..

Is it okay to tell a guy you were attracted to this?
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