He Used Us Both For Revenge

I never thought I would be telling this story, but here it is. I have been with my boyfriend for three years. We were the perfect couple, or so I thought. Everything changed the night I found out the truth. It all started when I noticed his phone kept ringing late at night. I told myself he was just talking to a friend, but my gut told me otherwise. One night, I decided to check his messages while he was asleep. What I found made my stomach drop. There were dozens of texts between him and a girl named Lisa. Flirty messages, compliments, even plans to meet up. My heart shattered. I confronted him the next morning. He denied everything at first, saying I was paranoid. But I had proof. The messages were still on his phone. He finally admitted he had been talking to Lisa for months. He said it was just a mistake, that he never intended to hurt me. I was furious, broken, and confused. I wanted to leave, but I decided to dig deeper. I started following him secretly. What I saw next made me wish I had never opened his phone. He was in a hotel with Lisa. I saw them together through the window. My world crumbled. I confronted him again, this time with all the evidence. He broke down and confessed that Lisa was more than just a friend. She was his ex-girlfriend, and he had been cheating on me with her for months. I felt betrayed beyond words. I packed my bags and left. But here is where the story takes a shocking turn. The next week, I received a message from Lisa. She apologized and said she had no idea he was with me. She claimed he only used her to get back at me for an argument we had months ago. I was stunned. I decided to confront him once more. I asked him why he lied, why he betrayed me. He looked me in the eyes and said he never loved me. That he was only using me for his own selfish reasons. I could not believe the person I loved had been this manipulative all along. Now I am left wondering if I ever really knew him. Or was I just another victim of his lies? Do I try to forgive him or move on and forget everything I thought was real? I need to know if I was the idiot for trusting him in the first place.