If she's done with him why would she add a sexy new profile photo, unfollow his instagram but not remove him from her followers list?

So this 21 year old girl has been in an on again, off again relationship with her nearly 40 year old boyfriend for the past 14 months. They moved in together to a new place after 3 months of dating, then he moved out 6 months later. They broke up when he moved out and didnt talk for 3 months, then became friends... show more So this 21 year old girl has been in an on again, off again relationship with her nearly 40 year old boyfriend for the past 14 months.
They moved in together to a new place after 3 months of dating, then he moved out 6 months later. They broke up when he moved out and didnt talk for 3 months, then became friends again then started dating again and he moved back in.
Now almost 5 months later he has moved out again, she deleted her facebook
and she unfollowed him on instagram where he's mostly inactive and has 1 post...yet she still has him following her and didn't remove him from her followers list.
She changed her instagram profile photo to a very sexy photo of herself with makeup, fake eyelashes, done up hair etc. Then unfollowed him but yet hes still following her...
What kind of mind game is she trying to play with him?
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