Why does this matter?

My boyfriend thinks I’m talking to his friend who messaged me a long time ago. My boyfriend cheated on me but I didn’t find out about it until a few days ago. I showed him the messages that happened between me and the guy which made my boyfriend sad because it was his friend but I just noticed that my boyfriend had already cheated on me before he was accusing me. After I found out about his cheating, he still accusing me. There’s nothing going on but he still thinks there’s something even though he cheated himself 🤨

Why does this matter?
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