Search Results: how to tell he his hiding something

Earlier this year I developed a crush on my coworker, and we even worked together, did nothing work wise, all day Superbowl Sunday and we talked a lot and became super friendly with each other.
I would be kinda flirtatious with her because she'd come talk to me before leaving for the day and she would come tell me about her day during break.
She would always be super into a conversation with her best friend, then when they saw me they'd stop talking completely and just look at me like they were hiding something.
Well, one day while she was sharing a lunch with me, she mentioned she had a boyfriend, and from that moment on, I stopped being as flirtatious with her. But she would still act goofy around me.
Anyway, after our meeting a few weeks ago, I offered to take her empty plate and cup because we were sitting next to each other. She didn't say a word and just looked at me like I just said something truly insulting.
Over the past week, she hasn't said a word to me, but will look over at me and I tried saying something to her the other day about work and she just walked off.
When I worked with her today, I just kept my distance, but she kept looking over at me, so as she closed her computer to leave, I opened it up just to have some fun and once again she looked at me, but different like I did something horrible.

At this point, I don't talk about anything we used to, and I barely even say hi to her now. Ever since I stopped flirting with her she's become more and more distant and rude.

Do i just completely avoid her and not talk to her at this point? She doesn't affect my work and I don't need to talk to her to do my job. She's just near by.