I did. My marriage was fine, no better than that. He was a binge drinker and we had big problems because of that at times, but otherwise rubbed along quite well and had done for 10 years. We didn't communicate very well, if at all, I felt more like a mother than a wife at times and sex was a bit boring. Ultimately we also didn't have a lot in common, which didn't matter at 21 but did at 31.
All that said, we were OK and probably still would be but I felt deeply unsatisfied and lonely. I used to fantasise about us splitting up and even hoped he would have an affair so I had a reason to leave. I don't think I had been 'in love' for a while to be honest.
He, and lots of other people, was shocked when I ended it. So was I really. But I just couldn't do another 50 years of just 'OK', it seemed like a prison sentence. We had no kids although we were ttc, and I think that solidified my need to get out. We had a relatively amicable divorce. I kept our flat, he walked away and I now haven't seen him for about 5 years.
I have never doubted my decision for a second. I met my now DH very shortly after and we married a couple of years ago. This marriage is light years away from my first one, they don't even compare. I am so so much happier than I ever thought I could be or would be. I feel a love for my husband that I never felt for the ex and and more 'myself' than I was in that marriage too.
I am so relieved I got divorced, I sometimes think of the life I could be having with my ex and I shudder. It would have been so boring.