As much as you want to save the other woman, right now you are still so vulnerable, in the thick of it. If you are just barely not drowning anymore, you can't go back in the water to save someone else.

It's really sad, but people have to make their mistakes, and then undo them and learn from them, just like you and me and all the other chicks and guys here.

It says a lot about your sweetness and goodness that you feel some responsibility for what will happen to his other women. But honey, he is scamming ADULT women. Legal adults (god, I hope) with full responsibilities and rights. If they miss out on the red flags, they will be just like you, much much wiser. And very conscious of red flags from now on. The less vulnerable OWs will run for the hills. Let's hope one of them turns the belt on him. Let's hope he runs into the WRONG woman, or her husband/boyfriend/father/brother while we're at it :)

You have no responsibility for what he goes on to do. You can care very much about it though. You can eventually put your info on him up on one of those "Don't Date Him" sites. But for now, you need every ounce of your energy. It's OK to be selfish right now.

I am not a Christian, but I pray for the new victims of my exH. He's gone so far down hill that no "decent" woman would want him anymore anyway. He'll have his choices of crank skanks who are so far gone that even prayer is hopeless. At least he probably won't rope in another one like me, pretending to be what he is not. I can hope, can't I?

Take care of yourself, first. Leave the rest up to God, or Whoever. In a few months, post his information, or have someone else do it for you. That's as good as it gets, and remember the best revenge, or absolution, is a life well lived.