PF - As one of the people who has been warning you about him, I'm relieved that you took some action - although concerned about the vindictiveness I'm hearing in your tone.
Also - restraining orders are all fine and good, but in a situation like this, they do very little to protect you. Their main usefulness is as a way to ensure that the police will take him into custody IF the police arrive at your home in time.
Unfortunately, in domestic violence situations, the police often arrive too late. Please don't make the mistake of thinking that a restraining order can protect you. Get the order, but then go stay somewhere that he wouldn't think to look for you. Consider what you need to do to protect your co-workers in the event he comes to your workplace.
As for your question about the young girl's parents - are you honestly concerned for her safety, or just want to get back at the OW by tattling to her parents? Honestly, I think they would just think you are a crazy "woman scorned". Even if they DID believe you, they might not be able to do much to change her behavior.
I suggest you just get yourself to a safe place while the inevitable fallout starts. Don't engage him anymore in any way. Be safe.
