How do you know if your coworker has a crush on you?

Anonymous
I work in a small company me, her and another guy its only 3 of us in that branch office. So, basically we have to deal with each other and talk a lot during work time. at some point i thought she might like me cause she like laughs at my jokes (not sure if actually my joke are funny or not), also sometimes we are sitting beside each other so she could just call my name and i would look at her, but she usually like tab my hands or arm ( not sure if this counts as a sign of interest or not ). also sometimes she compliments me when I notice a mistake or an error that they missed

also, we used to go for lunch together then we stopped then later on we started again going to lunch at the same time with each other and now she usually asks me when i will go for lunch so she could take her lunch break at the same time.

last thing one time she told me that she might have a crush on one of her friends but then she never talked about it again. point here is does she like me or she is just nice and friendly?
How do you know if your coworker has a crush on you?
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