Lost in transactions

My girlfriend cheated on me. So I asked her why she cheated? I also asked her if the guy had a big penis and had sex with her better? Her response was “it doesn’t matter.” She never answered the question with a straight answer. What does it mean?

It means she knows there are no right answers to those questions. So do you. I'm sorry this happened, but you both know people in healthy relationships don't cheat. Your questions are all about your insecurities, instead of the search for solutions to problems that led to the cheating. So you obviously don't want to work it out. Which is fine. Move on and try not to project the pain from this relationship onto the next.