How do I get him to stop the bullshit?

This guy I live with we used to be together. He's extremely petty. Does things out of spite. Hides my things I replace them then they show up like they never been lost.

Extremely manipulative. I can't take this anymore. How do I get him to stop until our lease is up... or do I have to run away?

How do I get him to stop the bullshit?
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