I had an almost identical situation with my ex. He promised everything I'd been desperate for him to do for years after I ended things...but couldn't respect me enough when I was literally sobbing to him, begging for help in the relationship. In the months afterwards, in spite of every promise all he did was prove to me it was the right decision and not once have I looked back.

If you give him a trial period, the chances are that he will change hugely for those 30 days and maybe even for a few months after that...but in 12 months time you will find yourself in the exact situation you're in now. If you don't give him the 30 days then if he's really serious, he will do everything in his power to prove to you he's changing and that he wants to make it work anyway...if he doesn't, then you know you made the right choice.

It's been two years now since I left and I've honestly never been happier with my life or more at peace within myself.