My boyfriends ex is keeping tabs on me?

My boyfriends ex is keeping tabs on me on Instagram by unfollowing me from their main but still following me on their private and they removed me from their private? But they still follow me on their private? What does this mean? (She was very toxic and horrible to him and hates him and has dated a lot of girls immediately after him and even exchanged naughty stuff with my friend who’s also a girl ) what do I do? Remove her back?

My boyfriends ex is keeping tabs on me?
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