We had sex and now he's acting awkward. Why?

Anonymous
There is a guy I met at work. Recently we got to know each other a little bit and ended up sleeping together several times.
We text each other now and he's cool and flirty when we talk but whenever I see him briefly he acts very awkward.
I saw him the other day on the street and he nearly ran away from me but then texted me later and said it was sweet seeing me.
Another time I caught him staring at me but he didn't even say hello.
Whats wrong with him? How can he be flirty and cool when we text but awkward in face to face situations?
We had sex and now he's acting awkward. Why?
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