My default position is always reading a post and looking at it from a 'how can this relationship be saved' point of view.
Except about the one with the picture of the niece. I did and do feel so so sorry for the OP of that thread. I've been there (nowhere near the same degree though) where you think absolutely everything is fine and suddenly you discover something that totally flips everything on it's head.
I said to her, this is my first LTB and was quite strong in my second post on that thread but because I felt she's really vulnerable in that moment to be manipulated by him. Maybe I'm wrong for that?
I was in a relationship with a guy I'd fallen really hard for. I found naked pics of his ex on his phone. Saw the time stamp - it was a day he'd told me he was doing something else. And my whole world just went spinning. He totally gaslighted me on it when I confronted him and I bought in to it.
Luckily, didn't live together so naturally had time to reflect on my own when I went back to mine.
I needed that time though away from him to get my senses together though because I was so happy with him I desperately wanted to believe it, I wanted to hear the lies so that the truth could go away.
As soon as I stepped away I knew though and ended it. Learned lesson in my early 20s no big deal - lucky for me.
If I had been married to him though and no place to go back to, no time to think it through on my own, I might have needed someone to shake me and say 'COME ON', it's disgusting, he's clearly cheating on you. So I would know I wasn't going crazy and could muster the strength to pack a bag.