Thank you so much, this is great advice.
But I think it may already be too late for us. We've been on the brink of breaking up before and my wife hasn't been happy in our marriage in a long time. Last week she told me this once again and that she's currently under too much pressure (other things going on in her life) to make any decisions but basically thinking about ending things. And then two days later we had an ugly fight and I think.... I think it's too late.
My SO actually did tell me when she noticed improvements. But there weren't enough improvements...
The tip with the "mistake journal" is great btw, I had never thought of that. Thank you so much, I will definitely start doing this :)