Dinner Exposed Their Secret Affair

AITA for catching my boyfriend cheating on me with my best friend and then confronting them in the most dramatic way possible I never thought I would find myself in a situation like this but here I am. It all started when I noticed my best friend Lisa acting strangely around my boyfriend Mark. She was overly friendly, always texting him late at night, and I could sense something was off. I decided to ignore it at first because I trusted both of them but then I found a series of messages on Mark's phone that confirmed my worst fears. They had been secretly talking for months and planning to meet up behind my back. I was devastated but I knew I needed to confront them face to face. I invited Lisa and Mark over for a dinner I cooked myself. I wanted to catch them in the act or at least get some answers. As they arrived, everything seemed normal until I saw Lisa sneak her phone into her pocket. I pretended everything was fine and served the food. Then I decided to lay everything out in the open. I asked Lisa if she had anything to tell me, and her face went pale. She tried to deny it but then I pulled out the messages I had saved. The room went silent. Mark looked stunned but then quickly tried to brush it off, saying it was just harmless flirting. I lost it. I told them I was done, that I never wanted to see their faces again. But then things took a shocking turn. Lisa broke down crying and admitted everything. She said she was feeling neglected and lonely and that she never meant to hurt me. I was furious but also heartbroken. How could my best friend betray me like this? Just when I thought I was going to cry myself to sleep, Lisa did something I did not expect. She reached into her bag and pulled out a letter she had written to Mark months ago. It was filled with love and promises. Then she looked at me and begged for forgiveness, saying she loved me and did not want to lose our friendship. I could not believe what I was hearing. Mark, meanwhile, kept insisting it was not a big deal and that they had only kissed once. I told him he was a liar and to get out of my house. As he left, Lisa begged me to give her a second chance. I told her I needed time to think and that I was not sure if I could forgive her. Now I am left with a broken heart, a shattered friendship, and a question that keeps eating at me. Did I do the right thing or am I the one at fault for trusting the wrong people? What do you think I should do now? Should I try to salvage what is left or cut everyone out of my life forever?