Why did she unfriend me?

Never met her in real life and added her onto facebook, we've been chatting and flirting. She would leave commetns on my post to get my attetion and such.

She asked if I have a girlfriend I was being honest and said no, as I did break up with my ex. She unfriended me after Valentines Day as she probably sees that my ex posted some photos with me as we spent the day together.

Then she unfriended me. Why would she do that?
Why did she unfriend me?
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