Alison, nothing is ever wasted. All life is a learning experience.
Yes DB ing has not saved your m. It didn't save mine or many many others that post BUT and you know the rest... it saved us.
We come out of this better people, better parents and better equipped to deal with other relationships and I don't just mean new partners.

I guess most if not all of us wish it hadn't happened. That our partners had at least tried to repair whatever the problems were and if we are honest then every single one of us had problems. We sometimes forget that when we first come and oh those rose coloured spectacles!
No one MLC or whatever leaves a truly happy marriage.IMO.
I can say that now I am many years down the road.
I hope life picks up for you. It will I know. We all get down times often more than we feel able to handle but we do. I guess thats life.

Be kind to yourself.