If all of y’all are on the lease you will need to get the landlord involved…
Report the behavior: Show your landlord clear proof of the disrespect, disturbances, or rule-breaking.
Keep a written record: Save text messages, emails, and dates/times of incidents.
Avoid retaliation: Do not damage their property or start physical fights, as this can get you evicted or in legal trouble.
Plan your exit: If your landlord cannot or will not do anything and you are both on a joint lease, look into when your lease ends so you can move out safely.