The end of a relationship is not the end of the world. It is just an end of a relationship that is not working for both of you, or for one of you. If you are a Christian it might be God’s way to save you from a wrong relationship.
If you think the person who dumped was or is the best person for you, then you are not thinking straight.
Stop holding on to nothing, and open your hands to what God is about to give you.