Yep, I'm divorced, too. Like most guys, it was good for a while, then it turned to crap.
In my case, she was horribly immature, although she did a good job blinding me to that, but I since I was smitten with her, I also blinded myself to her shortcomings, until it was too late. She always had to be right about everything, even if she had no idea what she was talking about. Plus, she came from a broken family (her father abandoned the family when she was 5, and her mother is an evil hag). So, she was really rebellious. In addition to having to be right about everything, I had to enthusiastically accept everything she did. It wasn't enough to just agree with her; I practically had to jump for joy. If not, then she would hold a grudge for days. Once, she got mad at me simply because I had woken up that morning.
Nevertheless, I saw all these signs, but I tried to be tolerant. Granted, I was no angel, and in retrospect, I was a complete AFC, but I wanted to make it work. She was the one who wanted the split, and I think in the back of my mind, I knew I had to let go, although I tried to hang on.
A few weeks before she told me she wanted the split (this is about 7 years ago), I had a sense that things were in trouble. So, when she told me, I wasn't surprised, but I was shocked, if that makes any sense. Something in the back of my mind told me that no amount of counseling or tolerance was going to save this marriage. So, we split after two years of marriage, and the divorce was final 18 months after that.