He'd tell you because I was crazy.
I'd say it was because he wanted us to both move in with his (wonderful and supportive) family.
I was crazy, but not THAT crazy.
We had been living far away from his family, but he'd landed a fantastic job in their home town. Before the move, his mother started calling me and telling me that if I wanted to live in her house, I'd have to be respectful, and not go out drinking all night and coming home drunk -- something I'd never done or conceived of doing -- or what chores I would have, or how loud I could be, and when we would eat, and so on. I told him that I could not live 24/7 with his mom. I said I was moving to MY mother's and when he got us a place of our own, I would join him. He didn't. We divorced.
The divorce was fairly amicable. That was all about 30 years ago and I never remarried. I did shack up with a wonderful man for about 20 years, but I eventually kicked him out because he'd shrink into the shadows when I most needed support and I was tired of feeling emotionally devastated when I reaching out for succor and instead finding a void. I explained that I'd rather know that no one is there to help if I'm flailing about than to have someone I trusted stand by and do nothing. Yeah, I'm bitter about that one. I still love the guy, but sheesh.