You're friend of his ex
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Yeah, you never really was interested in your friends relationship but... hey, you're best friend was crying about break up so... you decided to talk to her! And that's where you got information that Leon cheated on her. Not that it was true, you knew that he would never do that but... you stayed with her, that's what best friends do, right? Yeah... you still not convinced. How about talk with Leon? You will really got other version, right?