My ex moved out 6 months ago. She left stuff behind. I signed a new lease. How long do I have to keep stuff she left. She said she didn’t want it.

I would put this in writing to your ex and send both regular mail and certified mail with return receipt that she has 30 days to gather all her 'stuff' from your house and that she can have police present if she is concerned for her safety. Ed Dimon, Esq. 732-797-1600