AITA for exposing my cheating boyfriend and best friend?

AITA for exposing my boyfriend after I found out he was cheating on me with my best friend? I never thought I would be in a situation where I would have to confront betrayal from both my partner and my closest friend. It all started two months ago when I noticed my boyfriend, Mark, acting strangely. He was secretive about his phone and would often hide it when I entered the room. I brushed it off at first, thinking I was overthinking. But then I started noticing little inconsistencies. He was missing from work at odd hours, and I would find unfamiliar lipstick marks on his collar. One night, I decided to follow him. I waited outside his apartment and saw him enter with someone I did not recognize. My heart sank. I decided to sneak closer and peek through the window. To my shock, I saw Mark kissing my best friend, Lisa. My world collapsed. I felt like I had been punched in the stomach. I could not believe it. I needed proof, so I took pictures from outside. The next day, I confronted Mark. He lied at first, denying everything. But I showed him the pictures. He froze. I told him I was done. I also decided to confront Lisa. I thought I should hear her side. When I called her, she admitted everything. She said she was lonely and that Mark had been emotionally distant for months. She said she never meant to hurt me, but she could not resist. I was furious. I felt betrayed by my partner and my best friend. I decided to expose everything on social media. I posted the pictures and told my story. The fallout was intense. Mark was fired from his job for cheating on his employer, and Lisa lost her friends. But the real shock came when Lisa messaged me privately. She confessed she had been sleeping with Mark for four months before I ever found out. She said she was sorry, but she could not undo what she had done. I felt devastated. I thought I knew everyone around me. Now I am left wondering if I will ever be able to trust anyone again. Do you think I did the right thing by exposing them or should I have handled it differently?