Can roommate sue me unknowingly throwing things away if my name is not the lease?

Yes, your roommate may have grounds to sue you for throwing away their belongings, even if your name is not on the lease. Property laws typically grant tenants rights over their personal possessions, regardless of lease agreements. However, the outcome would depend on factors like the value of the items, whether you had permission to dispose of them, and local laws regarding personal property. It's advisable to communicate and resolve such issues amicably to avoid legal complications.