Why would an ex start acting nice, by approaching you and chatting a bit?

My ex and I were freinds then after we broke up she was really nasty to me. Then she ignored me and kept putting herself in my path. Today she actually approached me and said hi. Then she started talking yet all I wanted to do was make a nice exit.

Though it confused me why start acting nice? What changed in her mind that would let a shy girl approach her ex?
Why would an ex start acting nice, by approaching you and chatting a bit?
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