How should I act around my crush? How can I be sure that my crush also likes me?

Anonymous

We work in the same place but are in different departments. We come, leave and take breaks at different times. So obviously we rarely have time to talk each other.

I feel that he also steals a glance at me, which lets us make eye contacts often, but whenever I’m in that situation, I’m too shy to keep it and even try to avoid looking at him somehow.
In the mean time, he sent me a red heart emoji after “see you” in texting. I wanna let him know that I have a crush on him but I don’t know how to and still cannot be sure if he likes me or not.
And that texting was something related work and actually was our very first one. Honestly I don’t know how to start private topic now. How can I develop our relationship in this situation?

How should I act around my crush? How can I be sure that my crush also likes me?
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