Why did she delete me then re-add me?

Anonymous
So me and this girl I go to college with used to talk all of the time. It was a lot of flirting. She just randomly stopped talking to me out of the blue. She even deleted me on snapchat. It was never the same after that. I was friendly and acted like it didn't bother me. It actually did because I don't know what happened. This was back in December. Randomly yesterday I get a notification on snapchat. She re-added me... Why did she do this or in general why do girls do these things?
Why did she delete me then re-add me?
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