If he broke up with you two months before his divorce was final how is he believing that you ended it?

It also isn’t possible to be in a commited relationship with married people. And since he became single he left you, two months before divorce was final, so at no point he was commited to you.

Maybe you see it as commited relationship because you are commited to him, which I totally see as you devoted so many years to him. But it’s not how commited relationship work. You being commited to a person doesn’t make it commited relationship, it has to be mutual commitment. You calling him your fiancée, wearing a ring and saying you are engaged a year after a break up, doesn’t make you engaged.

That’s why I think working with a professional could help you to to understand what it means to be in a commited relationship and distinguish between reality and fantasy.