I messaged the OBS yesterday and minutes after I sent the first message confirming she's the right person I get a lot of angry messages from WW asking why I'm talking to her and then threatening to hurt herself if I don't stop.
She claims she heard through a friend of a friend but I suspect that is a lie.
This is one of the most ridiculous lies I have seen in this forum. You emailed the OBS, and within minutes the OBS had told a friend, who told another friend, who immediately contacted your WW and told her all about it?
This boneheaded lie suggests that there a network of friends of the OBS who are on 24/7 stand-by to relay messages to the woman who was having an affair with the OBS's husband, because that is what friends of the OBS would do.
That makes perfect sense...It's so obvious, when you think about it.
Or, how about the OBS mentioned to her wayward husband - the AP - that she was getting texts from some guy she didn't know, and the AP crapped himself, contacted your wife, and told her to make you stop?
I told the OBS tonight and she confronted OM. He has admitted to a physical affair as we all suspected.
WW has now turned nasty, blaming me for the affair. Saying he made her feel good etc. She's now blocked.
The change in your WW's mood is only to be expected. She has transitioned from having two men wrapped around her little finger to being dumped by both, and she is having a hard time adjusting to being tipped off her cake-eating throne.
And wouldn't you know...It's your fault.
What this shows is that your WW is taking no responsibility for her actions, and that she was and probably still is in contact with the AP.
Blocking her is the best idea. Her fantasy bubble is well and truly burst, and she wants to blame someone for that, as long as it is not herself.
...then threatening to hurt herself if I don't stop.
This is blatant emotional blackmail, a weapon she deployed because the AP told her to make you stop contacting his wife.
So here is a shield for you.
What you tell your wife if she ever mentions hurting herself or suicide again is that you are researching how to have someone sectioned under the Mental Health Act for their own good, and that if she mentions self-harm again you are going to begin that process.
Note to non-UK forum members: in the UK it is possible for a person to be taken into a form of protective custody if their behaviour threatens the health or well-being of themselves or others due to mental issues.
Genuinely suicidal people tend to withdraw, stop communicating, and the people around them are shocked and surprised if they kill themselves, because nobody saw it coming. A genuinely suicidal person does not use their suicide as a bargaining chip to try and control people. A manipulative narcissist does.
However, even if what she says appears to be an attempt to use your concern for her well-being as a way to control you, this is a subject area where erring on the side of caution is essential.
Although you have blocked your wife as far as communications go, I think it would be a good idea to let her parents know that she is threatening to harm herself.
They need to know that, and if her statements are baseless threats to try and manipulate you, the fact that they bypass you and instead impact her parents will be a deterrent to her trying that tactic again.
You have blocked communications with her, but another potential shield for you would be to tell your wife that every message she sends you will be forwarded to her parents.
That will help to clip the wings of her attempts to emotionally manipulate you. The worst thing you could do is to give in to it.
I am sorry you have been hit by this wagon-load of crap. We all got hit by the same wagon, just slightly different models, in different colours, and different locations. And we all found our ways to get up, dust ourselves off, and get on with the rest of our lives.
You will too. And we will do whatever we can to help you do that.