The worst part was realizing that it was over.
No.
The worst part was realizing that it's being over was for the best. You both tried so hard for so long to make it work, but it was just time to say that enough was enough.
He was right. You don't need rings or vows or silly fucking traditions to know that you loved each other. You had both known for a long time.
It hurt more because you finally had the fucking balls to admit it. And that was no one's fault but your own.
Now, as you bury your face in his neck and sob the words one last time, you let go of what you'll never have and just appreciate what you did while it lasted.