Girls, Do you pretend to ignore a guy you like?

This girl i like shows some subtle signs she does like me. Like she would always say hello to me and starts talking to me and only me at work. Now she acts like I'm not there but puts herself situations where it's easy for me to approach her, but acts like I'm not there. The moment I approach her she seems happy to talk to me. When I talk to her she is just staring right into my eyes. What is going on? It feels like an ice breaker everytime we talk and see each other.
Girls, Do you pretend to ignore a guy you like?
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