She sighed before talking to me then quickly walked away?

I flirted with this girl but she seemed aloof, so I backed off and never asked her out. She then became hot and cold, like she would be jumping when saying hello to me for one time, and pretends not seeing me for another time.

I saw her today and I pretended didn’t see her so we don’t need to have an awkward conversation. She stopped me by standing in my way, took a deep breath like she was sighing, asked me “how’s your day”. Then she walked away before I could answer her.

What was that about?

She sighed before talking to me then quickly walked away?
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