If this breakup is agreed upon, is it necessary to engage a lawyer?
She persisted that she was not allowed to go to the wedding when she was invited. Do you think that she may persist with you?
What if she incurs debt after your break-up and you're separated but you don't have a divorce decree? You're responsible for half of that debt. I'm not a legal expert but you may want to consult with a lawyer.
Do you have a separation agreement notarized by a lawyer?