You can't lose what you never had, you can't keep what's not yours, and you can't hold on to something that doesn't want to stay. If you made it before them then you can certainly make it without them.
No matter what, once in your life, someone will hurt you. That someone will take all that you are, and rip it into pieces and they won't even watch where the pieces land. But through the breakdown, you'll learn that you're strong, and no matter how hard they destroy you, you'll be able conquer anything. Your new life starts today. Don't waste it trying to get back what was taken away.