Why is my ex being nice?

My ex and I haven't really got along over the last couple years, now she is being nice to me and I don't know why. Does anyone have any ideas?
Updates:
4 mo
We broke up 2 years ago. She broke up with me. We had differences over the last couple of years. We do work with each other, last year I had to do move stores. But this year I got to go back to the store I work with her. Now she is getting along with me. I don't know if working together is factoring into it or if she does want to be friends again.
Why is my ex being nice?
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