Should I straight up tell her how I feel?

So basically I used to work with a girl and back in December I basically did tell her how I felt but at the time she was in a relationship... She's not anymore, We stopped talking for a few months and recently started again and I still have those feelings for her...

I don't know if she even likes me in that way but since we started talking I can't stop thinking about her
Should I straight up tell her how I feel?
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