Why is my ex suddenly flirting with me again?

Anonymous
My ex left me over 6 months ago. It was hard for me but I got through it and moved on well. She left me for another guy and they are still dating. But she's suddenly starting to flirt with me again, over text and stuff. Just small things like teasing and sending me hearts and stuff. She hasn't done that to me since before we started dating when she was interested.
I only want to be friends with her and she's said the same before but I have no idea. Why is she suddenly doing this is what I want to know.

Thanks.
Why is my ex suddenly flirting with me again?
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