How is he not awkward around me?

I admitted to my coworker almost two months ago that I liked him. He said he felt the same but had a girlfriend at the time and didn't want to destroy things between them. We haven't talked since but we work near each other. I feel so awkward being around him, I can't speak to him nor anyone around him. I'm still into him. But he can speak to me (sometimes) and isn't uncomfortable around me knowing I like him. He was in the break room today and I sat at the table next to him on my phone. He's talking to another coworker who was sitting at the same table at me and didn't looked bothered I was sitting there.

How is he not awkward around me?
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