Aita For Catching My Boyfriend Cheating And

AITA for catching my boyfriend cheating and then doing something I regret? I never thought I would find myself in this situation. It all started last week when I decided to surprise him with tickets to his favorite band. I thought it would be a sweet gesture to show how much I cared. I planned everything perfectly. But when I got to his apartment, things felt off. His phone was on the table with notifications popping up. I peeked and saw messages from someone named Lisa. My heart sank. I did not want to believe it but I had to know. I looked through his messages and it was worse than I imagined. They were more than just friends. They had been seeing each other behind my back for months. I felt betrayed, humiliated, and furious. I wanted to confront him right away but I knew I needed proof. I took screenshots and left quietly. The next day I called him and told him I knew everything. He denied it at first but then he broke down and admitted to the affair. I was devastated. I told him I needed space and hung up. I was so angry I could not think straight. I decided to go to his apartment and confront Lisa. I wanted to see her for myself. When I got there, she was surprised to see me but invited me inside. I demanded to know how long they had been seeing each other. She looked guilty but then she told me something shocking. It was not just an affair. She was pregnant. The girl I had trusted was carrying his child. I felt my world crashing down. I did not know what to do. I left the apartment in tears and decided to call him again. I told him I wanted to meet and talk. When we met, he begged for forgiveness and promised he would stop everything. I was torn but I decided to give him one last chance. I thought I could forgive him if he was honest and committed. But then Lisa called me. She told me she was not pregnant. She had lied to get back at us. It was all a lie. I was stunned. I felt used and manipulated. I do not know what to believe anymore. I feel like I lost myself in this mess. Should I trust him again or walk away for good? I am so confused now.