Meeting with his ex wife

I can't quite believe what has happened this morning. I woke up in the night ear ache and came into work but felt awful so rang the doctors and they said to go down there for 11 am. So left work at 10.30 to drive to docs. Pulling out of work I saw narc's first wife, I have never ever had any contact with her and narc used to tell me all sorts of awful things about her. So anyway, she did a double take at me and she smiled, that kind of sympathetic smile. I pulled round the corner and put my window down and asked her if she wanted a lift. She came over, got in the car and gave me the biggest hug ever and asked if I was ok. I was so shocked. She said to me that whatever I would tell her about him, she already knew and that she had lived it. She was so lovely, not at all like he had said. She talked about the abuse she received from him, the name calling, the heavy drinking, the lies, the sorry presents , everything I had been through. It was crazy. She said that her children loved me and that she knew how much I loved them and that they talk about me all the time . She also said that narc is moving in with ow this week but has told their eldest that it's just because he can't afford his flat and that she's a temporary girlfriend???!!!!!
She is nothing at all like the woman that narc explained. She knew the life I had lived and she said that she had wanted to warn me but she knew that I wouldn't listen.
I feel sick about him moving in with ow but I feel so pleased that I saw his ex wife today. She have me her number and asked me to call her if I would like to see the children.
I said that he would go mad if he knew and she said that it was nothing to do with him.
Is it breaking no contact if I see his children? They are lovely and I would love to see them so much.
I feel like I have closure here as she backed up everything that happened to me and that feels good. She said that his children are so mad that he is moving on with ow and don't want to see him anymore but I just dont know what to do now .

All advice appreciated, even the tough stuff .
Thanks xxxxxx