My girlfriend is always starting arguments with me about my past (need advice on why)?

Whenever we are texting she randomly starts having an attitude and begins talking shit about my past hookup. She then goes on by insulting me or calling my hookups names, like I don’t think she realizes that I did whatever I wanted when I was single and yet she’s mad that I did.

My girlfriend is always starting arguments with me about my past (need advice on why)?
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