A marriage lasts until one person dies. It does not end, because it is a permanent contract and vow by two people before God. He made marriage that way, we do not have the ability to change it.
So even if your ex because Adolf Hitler, you’re still married to your ex in God’s eyes, unless the marriage itself never existed in the first place.
Certain deceptions and other impediments can render a marriage that was presumed to exist at one time actually one that was null and void.
If he was Adolf in disguise before the marriage, then it’s quite possible the marriage was never valid in God’s eyes in the first place. But it is in fact possible to even marry Adolf too. And God help you if you did…
This fellow does sound truly awful and there’s high hope for you. Nevertheless…
There are some good documents on what makes a marriage valid or not out there. A marriage tribunal, if it is a good one, bases its understanding of marriage on what the Lord has revealed to the Church and helps you to find out whether it was or not a true and permanent marriage.
It takes time and effort to sit on a marriage tribunal and work with people who are not happy to see you and only complain to you about having to be there rather than being grateful you’re willing to give your time to help them out of a mess they themselves got themselves into. So treat them nicely and realize this. Would you want to be in their shoes?
You should however pursue this understanding yourself as it matters to your soul more than anyone else’s that you get the answer right. And if your marriage in the past was valid, that is that and you should accept it because that is God’s law. It is His will, so embrace it however hard it is for the best. If it is not valid, embrace that too and it will be for the best. Either way, whatever God wills is what is best.
Don’t decide that your marriage in the past wasn’t real because you feel you don’t want it to be. Decide based on what God’s laws about marriage are, because that is the truth and what is best for you.
Many saints have had marriages to people who were not very good, and were mistakes to marry. But because the marriages were true marriages, that was it. They were married and that was that. St. Monica had a marriage like that… and she saved her terrible husband’s soul and had a saint for a child. That’s something that lasts forever.
Some people have to remain separated from a bad husband or wife till they die because of circumstances like yours, yet still bound in the sacramental bounds of marriage.
We only have one life, it doesn’t last forever on this earth, some decisions are permanent and we have to live with.
This isn’t a message that can be easy to accept, far from it… but it is the truth. God bless you I pray!