Left my fiancé for my current husband. Together six years now, married for three, have a 5 year old. We are very happy! No regrets at all. He's way better for me and I'm glad he's the one I married. I can see myself growing old with him, he's my best friend and my partner, but I doubt my ex and I would've realistically stayed married more than a year or so.
He had a lot of issues, the worst ones being his alcohol problem which he would never admit, and his propensity for thinking his way was the only way. Oh, and his insane need to hold onto a house that sucked us dry and was literally falling apart rather than sell at a loss and start over so we could afford things like, you know, FURNITURE. Yeah.
My current husband and I rent and are WAY more comfortable, should be ready to buy something decent in a year or two with a solid down payment, pretty sure the ex is in the exact same financial position though, completely through his own stubbornness and stupidity. No thank you!