How should you act around a girl who rejected you?

Two weeks ago I asked a girl if she had feelings for me. She said no, I took her word at face value and I am okay with it. We work at the same place but for different companies so I see her everyday. When she come from her lunch break and see me she directly goes to look at her phone and say nothing. Then when she is leaving she says sometimes is on her phone but look back and always says good night. Other times when she exit she looks back expecting me to meet her eyes as she said goodnight and gives the wave gesture. After the rejection I do follow whatever she does but nothing more and I am okay with that. I am just wondering if she expecting me to do anything else or leave it as the way it is now.
How should you act around a girl who rejected you?
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