Shy Cancer guy acts weird around me. What should I do?

Anonymous
We're co-workers since January. He stares at me a lot but is awkward and aloof when I'm around. He can be very friendly and sweet to me but then a minute later he would keep a distance from me like I'm a plague. He is not like that to any girls in the office. He has no problem talking and laughing to them but ignores me in public. I don't know why I'm treated that way. He knows I'm a nice girl and willing to help him as much as I can. Did I do something that annoyed him but I might not realize? I heard Cancer guys are very sensitive.
Shy Cancer guy acts weird around me. What should I do?
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