Why does my ex's friend spy on me?

My ex broke up with my last year. She played a lot of mind games. It hurt. Everyone saw the games she played as we go to the same gym together.

Now, she hasn't been to the gym as much. Although her friend has been spying on me. Every time I talk to a girl, I can see at the corner of my eye she is staring at me. Another guy friend of hers has asked if I am single. It seems as if they're fishing for some information and I am only telling the truth in return.

What is up? Why are they doing this?
Why does my ex's friend spy on me?
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