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Spiderman created a topic of You and I can't do this

Before I start let me just say I forgot their names sorry lol

Okay so I love rereading this manga every once in a while but this time in particular a question appeared
What are you to do in a situation like the MC's when a persistent ex appears like that? And given it's gonna be rl and not fictional, it's not gonna be easy to just tell your boss about your past or call the cops about harassment because there's a chance due to the ex's status they'll just brush it off. Unless there's certain times the cops may look into it
So like...what then? What are you even meant to do to get someone like that to leave you alone?