Ex's friend is stalking me. Why?

My ex and I broke up last year. She called it off saying she needed space. I respected it and kept my distance. Then, she began playing games. Everybody saw the games she played. She wanted me to chase after her but I never did. I kept my cool and blocked her on everything.

Her closest friend goes to the same gym as I go to. She is constantly looking at me all the time. There have been quite a few questionable things that her friend has done. Such as, creep my social media account.

I know she is playing this game. I know that my ex's friend is stalking me.

I'm just curious as to why they are doing this to me?
Ex's friend is stalking me. Why?
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