Why is this coworker acting so hot and cold toward me after our argument?

Girl and I used to get along super well she asked if I was single would playfully push me and blush when people said she was my wife her friends were super nice, then we had an argument where she stared at me 24/7 and gossiped her friends avoided me and were not happy, months later we both apologized and then on my birthday she viewed my LinkedIn of all things even though everyone else at work was normal and said happy birthday, I found this creepy behavior and blocked her then I left the department now she always looks and stares when I’m near her and her friends are super nice again which is weird?

Why is this coworker acting so hot and cold toward me after our argument?
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