Hi Kindly, I haven’t read your whole sitch....but YES leave him alone!! If you catch yourself being consumed by the thoughts of him being at home but not really there, maybe it would help for you to get out of the house too.
Always post here first before you want to poke the bear. Chances are you shouldn’t.
As for the threats with L....you can’t control what you say, but you’re in control of how you respond. Or lack thereof. Let him talk his talk.