Could it mean anything? Or maybe not?

There is this girl I look with. I think she may like me though I'm not sure. One day our other male coworker, who we are friends with also, said how me and him are dating. When he said that she gave me a dirty look for some reason. Also, later, I told her how I felt bad for another one of our female workers. She said I should feel bad for her (when there is nothing going wrong with her). Could these be signs of interest?

Could it mean anything? Or maybe not?
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