We had been going in opposite directions for the last 10 years or so. She became a drug addict. She hated me going to the gym. I started having to do everything myself. I woke up one day and said "I am not going out like this" so I left.
I am sure you made a wise decision. Everyone's experience is different. My wife and I have always been opposites in many respects, particularly when it comes to health and fitness. For a variety of reason, not all her fault, her health is shit these days. I am her caregiver. It definitely sucks sometimes and I unfortunately don't always hide how it makes me feel from her. But it is what it is. I remind myself daily that she didn't plan this life for us. I am with her until the end however far off this may be.
My mom was addicted to prescription psychotropic drugs and alcohol. How my dad put up with this for over 30 years is both a mystery and a lesson for me. He must have loved her a lot. I got out of that crazy environment as soon as was legally possible. I cannot imagine putting up with someone like my mom for any amount of time, much less until I died, like he did. So you have my sympathy for however much of your life you devoted to someone who could have dragged you to the depths of hell.
Hopefully, you realize that I am not passing judgment on others' situations. You did what was best in your situation. You are three years to the good and there is no reason to suspect that you won't live this relationship out until you are both very old and gray.