I think that having him come in ,get his stuff, and leave is a good thing for her part. And calling the police just to say he was there well not necessary. I am very glad you went over to check on her once he left.

I think just stop by to say hey, maybe invite her over for tea or what not. Say Jonah wants to see a baby as he doesn't remember being one? Something to make her smile at least.

Wouldn't leave a card, that is SO formal and being a lawyer, I don't think appropriate; could just scare her. She is probably in a turmoil right now; do I divorce him; do I let him back? do I go to counseling? do WE go to counseling? And having a lawyer leave a business card just may push her into the wrong decision.

And yes, anyone who lives in a neighborhood wonders where is the boundary with the neighbors - ALL the time!