Why does he act a certain way one day and different the next?

This guy that I work with that I have a crush on is really confusing. One day when we are working together, he won't say anything to me and he will completely ignore me and the next day he will talk to me a lot and sit near me on break and pay a lot of attention to me. Why does he act one way one day and different the next?
Why does he act a certain way one day and different the next?
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