I’ve read the full thread and think it’s disgusting that people are derailing it so much - bring it back to support for the OP! Leigh, whether we agree with you or not, you have, repeatedly, expressed your opinion and given your advice. Others should either ignore you or you should now ignore them - everyone is actually wasting pages and pages of potential supportive posts arguing with you (and there are a couple of others with similar views to you) and you are all keeping it derailed! You’ve got your point(s) across. Just stop.
Back to the OP. 
I was reading this last night in bed and it kept me up most of the night afterwards. I’m sorry you are going through this. I felt like I was reading my life, with a few minor details changed, up until a couple of years ago.
Like you, I wasn’t completely innocent but it was always a kind of feeling that wouldn’t go away - almost a psychic sense that my husband was going to cheat. His (“bitter bitch”) ex wife had warned me he wasn’t what he seemed but never elaborated, only hinted - and I was already conditioned to hate her with a vengeance, so it only made me hate her more. But it must’ve stuck in my head.
I became paranoid, insecure, needy but pushed him away at times too. When suddenly his relationship with his ex wife was miraculously healed overnight (they had 2 young children - who were poisoned against me by her and would hit me and my even younger son, who is on the spectrum, whenever no one was looking, but then act all innocent and angelic and say we were lying. They also told their mother that I burned them with hot kettles, would shower them with burning hot water - I never showered them, so this was how they were finally found out, at least to my husband - and pulled their hair) I was just expected to accept it and be ok with them being friends “for the kids” even though I wasn’t allowed near the kids, near her, my name wasn’t allowed to be mentioned... etc. He never stood up for me, just wanted an “easy life.”
I kept thinking he might be having an affair with her but would shoot myself down immediately after because I knew all she had done to him and to me so thought it would be ludicrous! However I couldn’t help the anxiety making me not sleep, making me like a mad woman, talking 100miles an hour... I had a breakdown. I got REALLY sick. I even posted on here about her and what should I do etc, never really putting my wet drip of a husband to blame, just seeing it as her trying to win and ruin his life once again by ruining our marriage.
Then I started having seizures. Up to 10 a day. My son (not exDh’s) went to live with my mum because I couldn’t even be trusted to be alone with him in case I had a seizure (he was 2 at the time). This went on for a year and I was seeing consultant after consultant, brain scans, tests - the lot. One day I was in the neurologist’s office and my husband wasn’t with me for once (he was very controlling and insisted on coming to every appointment, even though my mother was paying for the private consultants - I thought it was loving at the time but it was controlling looking back) and my Dr told me it wasn’t epilepsy, so couldn’t be treated with medication. I was experiencing stress related seizures. He had been told a bit about what was going on, but mainly from my husband's POV because I was never allowed to speak - my husband would tell him I’m paranoid, he’s worried for my mental health because my jealousy and depression is out of control...
Over the months he had watched the dynamics, quietly. But he wasn’t a stupid man - he knew what he saw and he said to me, “if you stay in the situation you are currently in, the one that is causing you to cry all day, feel anxiety all day and night, then you will never have a day of peace again. You will never have your health. You will never be able to drive again. You will never have your son living back with you. Get out of that situation now, because if you don’t, you could die - either from a seizure or by your own hand.”
A lightbulb kind of went off in my head and I went home and packed a bag and left. I filed for divorce the following day. He cried, said he didn’t understand, said I blindsided him... I doubted myself for a long time but one day I had to go to his house to pick something up and I still had a key so let myself in. I ended up being nosy and looking through some stuff on his iPad and found naked pics of his ex wife, dirty messages, bookings for weekends away - all while we were together. They even slept together the night before our wedding. No wonder she hated me and wanted to destroy me/him. Even on the night I was giving birth to our premature stillborn little girl, no one could find him. Turns out he was crying on her shoulder about “his” loss and she “made him feel much better!” 
I even read messages where he was telling her how loaded I was and that he won’t have to work again and that THEY will all be better off if she just holds on...
I never had a seizure again. I have my son back, I got divorced VERY quick, I had a prenup (I do have much more money than him) so he didn’t get a penny - even though he really tried to, i now am 10wks pregnant with twins, have a supportive, hard working, strong man who adores me and my son as though he’s his own.
I do have lasting health issues from the stress though - my memory is severely affected because of where in my brain my seizures were happening. Can be a blessing, can be a curse! I walk past family members or bff’s from school in the high street and don’t have a clue who they are, so almost feel like I have to wear a neon sign saying “I have brain damage, I may not remember you!! Don’t be offended!!!”
I also now have chronic fatigue and fibromyalgia - it’s manageable with yoga, exercise and calm living.
I know exactly what stage you are at in your head and it’s so tough to even read. Please, please, please know that it WILL get better. There are lots of us women (and men!) who know what you are going through. The realisation stage is freeing but terrifying. Validation isn’t always sweet, it’s painful and shocking.
But there will be a rainbow.
Feel free to pm me if you want.
Sending you all the strength in the world. X