Why do guys compare themselves to your exes?

Like why do they ask simple questions about ur ex like "what kinda car did he drive" "did he play video games?" "Did he watch football"? The guy I'm talking to asks these questions and I never understand why and I don't wanna ask because I figured he'll get defensive or something.. I don't ask questions about his ex.. so why does he ask about mine?
Why do guys compare themselves to your exes?
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