I don't know how I missed the OW's text to you Binders because I log in several times a day to check if you are okay.
Now, of course she can't eat and can't sleep - that's what happens when you cheat on your partner. She is in a proper state of worry .... but you, my dear Binders are in a state of grief.
I have worried over debts. I have worried over parental/sibling relationships that went wrong. I certainly worried when we got the shocking diagnoses of my late-DH's cancer. I worried for him, I worried for me and then got on with making the last 6 weeks of his life the best we could ever do.
But when he died, I faced grief. Now grief is one of the most horrendous emotions anyone can face. It is complex and not linear. It is simply 'not fixable'. The grief has to be dealt with in order to understand and reconcile into your new normal.
Whilst I lost my late-DH in reality, you have lost the person you believed in. The happiness you had has been stolen. The promises and dreams of the future have been trashed by two feckless human beings who thought they could conduct some sort of clandestine relationship without being found out ..... unless THEY decided to change the rules. The OW was always brazen in your company when you met up for meals - who knows what she and your Ex were planning for the future? To pull the rug from under your feet when the time was right?
So - as for the message: "I don't want X to get hurt and I've got my kids to think about" - it's too late. She cheated on X and she didn't think about her kids when she was sleeping with your Ex.
The breathlessness (panic) is actually symptomatic of grief. When that happens, you have to have strategies (usually CBT strategies help you to get through.) But first and foremost, you have to phone the Rottweiller sister and tell her. You'll sob and won't get your words out, but she will be able to help calm you down. If the Rottweiler isn't available (or you think you shouldn't phone her because she will rip OW's head off) have the phone number of Samaritans on speed-dial: THIS IS NOW A FREE PHONE NUMBER - 116 123
My DH left his 1st wife after about the 3rd time of infidelity. He walked into the lounge after starting a 2-10 shift, but had been told by the Gold Commander at 8pm that they were on 'an all-nighter - perhaps another 24 hours' so they could go home for 1 hour and explain (before the days of mobile phones). My DH walked in on his DW and NDN 'at it' on the sofa. Apparently, he couldn't accept the close proximity to home - two people he trusted doing it in his home was the final straw. (The other 2 infidelities had been people he didn't know.) They also went out as 2 couples. I don't really know much about it because I wasn't around then... but I recall DH talking about it as complete betrayal. It was part of our 'getting together/exclusivity conversation' 1 year after he had separated.
(Sadly, 7 years later when DC3 elected to live with us permanently, the DW tried to get her back by proving - via DNA - that DC3 wasn't even my DH's daughter. That proved to be correct. But DH couldn't stop loving her - and I was always a Step-Mum to someone else's child. DH fought on the grounds that DC3 only ever knew him as a DF because that is what DSD wanted. The magistrate gave custody to DH. )
Now I have told you that part of my story because PP have suggested that your EX could be the father of OW's children. There is no evidence for that. But please remember that the father of OW's children will always be her DH.
If it were me .... would I want to hurt OW?
Of course I would! I would want to rip her head off for the grief she has caused me and DS.
Will it bring comfort? No - you only think less of yourself and lose more sleep. You then have to use the little energy you have got figuring out whether you should feel ashamed at your own behaviour.
If you think you can do without any regret - then tell OW's DH.
I suspect that you are far too honorable to carry that out at the moment. You know the grief it causes and you won't want to wish it on her DH and DCs without just cause.
I'll be at early Mass tomorrow. I'll offer it up again for you Binders
Thoughts and prayers are winging their way to you 