Aita For Confronting My Boyfriend After I

AITA for confronting my boyfriend after I found out he was secretly married for five years and had a child I never knew about? I never thought I would be in a situation like this. I met David about two years ago at a mutual friend's party. He seemed charming, successful, and genuinely sweet. We hit it off instantly and started dating. Things moved fast, but I was happy. I thought I had finally found someone I could trust. About six months ago, David told me he was in the process of starting his own business and was working long hours. I understood. I never suspected anything was wrong. Last week, I decided to surprise him at his apartment after work. When I got there, I noticed his phone was left on the kitchen counter. I decided to take a quick look, and I saw a text message from someone named Sarah. It was about a child and a marriage. My heart stopped. I opened the message and saw that David had been married for five years and had a five-year-old daughter. I could not breathe. My world shattered. I confronted him immediately. He tried to deny it at first, but I showed him the messages. He broke down and admitted everything. He had married Sarah when he was twenty-two. They had a daughter who was now five. He had been hiding it from everyone, including me. He said he was scared I would leave him and that he loved me too much to lose me. I felt betrayed beyond words. How could he keep such a secret? How could he lie to my face for so long? I told him I needed time to think. I left his apartment and went straight to my best friend's house. I did not sleep all night. The next day, I decided to do some digging. I found out that Sarah had no idea about me. She thought David was single and completely honest with her. I also found out that David had been sending money to his wife and daughter every month. I was furious. I could not believe I had been dating a man who was a married father all along. I called Sarah and told her everything. She was devastated. She said she had no idea he was seeing anyone else. I felt terrible for her. I realized I was in the middle of a nightmare. I decided to confront David again. I told him I could not trust him anymore and that I was done. But then he said something that made my blood run cold. He begged me to stay, said he loved me more than anyone, and promised he would leave his wife if I gave him a chance. I was about to walk away for good when I found out the shocking truth. David had never been married. The whole marriage and child were a lie. He made it all up to manipulate me, to make me feel sorry for him, to keep me from leaving. I was stunned. I felt sick. I realized I had been a fool. I do not know if I should tell Sarah the truth or just cut all ties. I am so confused and hurt. Am I the idiot for ever trusting him? Or was he the real villain all along?