My boyfriends brother

Elizabeth has a boyfriend named Estarossa. He is 5 years older than her, so 21. Elizabeth is 16. One day, she comes home to Estarossa to meet his family when his younger brother, Meliodas, 18 years old meet her. He takes her to a room while Estarossa was leaving to get Zeldoris.

"Where did she go?" I asked.

"I don't know. She said something about breaking up because of blah blah blah, I just let her go." He said.

"What?! Why?!" I asked.

"Don't know. Don't care." He said.

"What did you do to her?!" I asked.

"I just told her about what you did to that other girl a couple of years ago and she ran away." He said. I walked up on my room.