soryy you have to go through this again.
I have been there and i would not wish it on anyone.
I suspect he is begging for another go because he is so scared of his future too without you and the family. But again it is for selfish reasons. He doesnt want to have to sort himself out - it is the easy option.
we have done a lot of counselling and i suspect you will too - either alone or together. I would sugest alone at first for you. You know you should never be treated the way you have (and he should have learned that too from last time).
If you do have him back - you will be saying its ok to treat me like that. But that is not to say you can not have a realationship with him still. it will just have to be different now.
one of the best things my counsellor said to me is to stay in the realationship only if it is good for me (that is not to say walk away at the first sign of trouble), but only if it overall makes me happy for the right reasons.
I dont think you are different from a lot of people who want the 'fairy-tale' marriage. But he obviously sees marriage very differently. But now he knows how much monogomy means he has the choice to either respct what you want or get out - his actions the second time have clearly shown you that he is not prepared/able to have a monogomous relationship. You have to ask yourself if you can live with that.
You can and will be happy again - but instead of putting your energies into making your h happy put them into yourself - it really is worth it.
Your h needs to decide if he can live by your rules now - this may be a habit of his and if he wants to give it up he can but HE NEEDS to want to himself.
so i would suggest you stop worring about the end of your marriage - the old vows are worthless now anyway. And work on what the new relationship is going to be with your h - is it going to be only father to your children or more - it is up to you now. And it is ok if you change your mind over time too.
Once you find how strong you are you will be able to live without your h and then you can have the choice of whether you want him in your life still. A good solicitor will also help you find the strengh to know you can do it alone if you have to.
Anyway - good luck with whatever you do and if you want to cat me.