I told an outsider about my fight with my partner, and that person loved to laugh at me, but I already told him. What should we do?

You must be indifferent to other people's jokes. Don't be afraid of jokes. When people see that you are afraid of being laughed at, they will think that you are easy to bully and will laugh at you next time. If you tell her about you, tell her that I told you this when I was your friend, and you laughed at me. Tell her your anger. She'll back down.