Friending people on Facebook question. I went to some getaways for the week end where I chatted with them, hung out with them, etc...?

One girl I even went out shopping with. Strangely, she unfriended me on Facebook a week after meeting me and we haven’t spoken since the day after the event. Why did she unfriend me on Facebook? Another girl forgot who I was. Should I avoid trying to make friends at these kinds of events?
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