Don't say a thing to that person that broke you. The one that told you, that you are not enough to them, the troublemaker, the toxic one, the annoying one, the wrong one. Don't chase that person who broke you to stay. It's better to stay quiet because, if your love wasn't enough.... Do you think your words will matter? No, not a little bit. Just make you worse then before.
If your love didn't bring him come back, worst with word. He will not care anymore about you. It will be to late to bring him back. Because now he is happy with his new beautiful sweetheart.