How to tell if a co-worker has a crush on you or is just being nice? It's an office environment and it's really hard to tell if someone is?

How to tell if a co-worker has a crush on you or is just being nice? It's an office environment and it's really hard to tell if someone is interested in you, because everyone has to be nice at work to their co-workers. Everyone is nice and kind to everyone. So what are the signs that YOU are special to someone?
How to tell if a co-worker has a crush on you or is just being nice? It's an office environment and it's really hard to tell if someone is?
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