My advice on rebuilding trust...
I was once putting away my ex-husband's jacket. It slipped off the coathanger onto the floor, and when I picked it up, some little blue pills rolled out of the pocket. So I looked in that pocket, and found two receipts. One for a wine shop, one for a hotel, in a city that we routinely went for nice weekends away to. We would go to that wine shop and buy some booze and chocolate. We'd spend the day shopping, go out for tea, have a few drinks, go back to the hotel room at about 11pm, carry on having a drink and nibbling, have filthy sex... Ah, the days before children.
The receipts were dated for a weekend when he told me he was staying at a friend's house in the same city. He never used viagra with me.
I confronted him, crying. He said it wasn't what it looked like. The viagra was a friend's, he and his mate went out into the city and drunkenly decided to stay in a (very swanky) hotel rather than go home (???). The wine receipt was just for snacks (I only had the credit card one with the total, not the breakdown).
None of this made any kind of sense to me, then or now. I rang the hotel and they wouldn't tell me a single thing about the booking. But the receptionist clearly wanted to help me. She asked me how much the receipt was for. I told her, and she said that it was coincidentally for the same sum as a weekend 'bed and breakfast' deal they offered on their posh suites. She couldn't - wouldn't - tell me if that was what had been booked, but to look on their website at the prices and I'd see for myself, and also see that you have to book in advance to secure that rate.
In spite of this I chose to believe him. He was so genuinely remorseful at how it appeared, so loving. And he was my husband. I felt I had to believe him - or at least get past this. Because I loved him, and I believed that, whatever happened that night, he loved me too and wanted our marriage to work. I believed that, even if I knew he was bullshitting about that night. Whatever happened, I believed he was genuinely sorry. So we moved on.
I never loved him in the same way again. I managed to suppress it. I managed to not think about it and doubt him all the time, it was never ever mentioned and I didn't dwell on it or simmer - I genuinely did forgive him. But I didn't forget, and it wasn't ever the same again, even though I tried my very best. I think once someone has properly broken your heart, it never goes back in the same order again.
But I was pleased about this. I was pleased there was a cold corner of my heart. I felt like he couldn't hurt me again. The worst had happened to my marriage, we had come through it, my eyes were now fully open. I wasn't a naive little girl any more, the one that had married her childhood sweetheart. I was a grown woman, a forgiving woman. Our relationship was more equal now. The blind devotion had gone.
Fast forward 5 years. It's 18 months after our son was born, and our marriage is struggling.
My ex didn't take to parenting too well. He didn't like the change in his lifestyle. He believed - still believes - that parenting shouldn't change you. There are babysitters. Life doesn't need to stop. I believe - still believe - that when you have a child, your priorities shift. I don't think either of us is or was right or wrong. It's just a fundamentally different approach.
I tried everything I could to make the marriage work. Changed my hours at work, tried to change my appearance, meet him in the middle on our social life... I wanted to go to counselling. He wouldn't consider it. And he left.
About a month after he had gone, I discovered he had been having an affair for the past year. He had been using his friends as alibis and when they found out, they were disgusted and told me that he hadn't stayed round theirs in months. Years. I knew the woman I was told he was having an affair with. He had once stayed logged in to Facebook on our shared computer and I didn't realise - I just launched it, saw 'I' had a private message, straight away opened it. From this woman. He was going on a stag do. Her message read, 'Wish there was room for me in the case x' I asked him about it at the time. He said it's the kind of thing friends say to each other. Yes, a bit flirty, a bit bantery, but nothing to it. And I chose to believe him. Maybe she did really want to go to Prague?
He still denies that he had an affair with this woman. Despite all the alibiless weekends away, despite that message, despite the fact that he is now married to her and they have two children together, despite the fact he was living with her within 3 months of leaving. He absolutely DID NOT cheat on me. He needs this to be the narrative. I'm past caring.
So. How do you move past this? I would say it's not impossible, but I don't think you'll feel the same way about him again. And once he's done it once and got away with it, it's much easier to do it again.
I don't say this bitterly. I don't think all men are cheaters or losers. Mistakes happen. Maybe this was a one off. But I don't think that matters. You won't feel the same again, however hard you try, even though you will still love him dearly and want everything to be as perfect as you know it can be. A little bit of your heart will always be cold.