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You cannot evict your ex from the apartment but your landlord can. You will still be liable under the lease you could have a private cause of action against your ex for rent you pay and damages you can prove he did to the property. You could terminate the lease in writing (you would still be liable under the lease but it would force your landlord to deal with you security deposit and the eviction of your ex). Your landlord also cannot charge you rent if the property is re-rented to another tenant, so the sooner he gets a tenant in, the sooner your obligation to pay under the rent ends. If you could terminate the lease and ask the landlord to do a walk through with you to establish the condition of the property, it might force him to go against your ex for the damages (you would still be ultimately responsible for damages until the termination of the lease). Your ex would be considered a tenant at this point and become the problem of the landlord.
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