Falling in love knowing it wouldn't work

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There is this girl at my Job we've know each other since I started 8 months ago, recently I've been feeling like I'm starting to really fall in love with her, she is always happy and is fun to be around and she just brightens up my day when she's around. The sad news is, is that she already has a boyfriend. So my question to you is have you ever fallen in love with someone even though you know it would never work?