Dear Op,
I have just read your whole post - my heart goes out to you.
Several things stand out to me;
You have had to point out how inappropriate his behaviour is - this won’t change. Do you want to spend the rest of your life being the wise one, the guide, the one that keeps him on the straight and narrow?
As you both age, imagine a scenario where you fall sick and he has to make decisions on your behalf - would you trust him to do that wisely?
I don’t think it is possible to have a healthy relationship with an emotionally immature man and you will not be able to change this. This is how he is - it is highly unlikely he will be able to work on himself and change.
I left my very long marriage nearly a year ago. We hit the rocks around issues of his infidelity. It became impossible to work through as he wanted me to swallow his story and it was full of holes. We couldn’t move forward and the initial wound caused by his actions just got bigger and bigger.
It took 6 torturous months for me to do that though and we still have much to sort out regarding finances.
As for life on the other side......for me the process has not been linear.
I honestly have hardly missed him as an individual, as a presence in the house. However l have suffered immense loneliness at times and l do miss certain things about having a partner. Some friends have not been great and that has hurt. I have had to construct a whole new life and that is ongoing. Sometimes l have little energy and then it’s hard to put yourself out there.
What is positive is that when l am feeling ok, l really feel great, much happier and more joyful than l have ever felt.
I have learnt so much in the last year about unhealthy relationships - l feel l was so naive, trusting and vulnerable before everything went pear shaped. Now l feel l have matured and now see the world with wiser eyes.
What l am trying to say is that if you leave, your life will change but over time you will adapt and accept and move forward. It won’t feel easy but life never is whatever you are doing, whoever you are with.
But l can guarantee you will grow into yourself and experience a deeper joy in life than if you are stuck in a toxic dynamic where you give the best of yourself to another person who cannot reciprocate.
Take care xx