Someone sent me Videos of my girlfriend having sex with another men she says it's a ex from over 2 years ago should I belive her?

Someone sent me a sex tape of my girlfriend having sex with another man saying the video is going around our college and the guy in the video has HPV and I should get tested. I question my girlfriend. She's saying it's an ex-bf from over 2 years ago that she dated, but her parents broke them u, p, and he has not gotten over it. I have zero idea how he finds me when both of our Accounts are private and our relationship isn't public information. Should I believe her?
Someone sent me Videos of my girlfriend having sex with another men she says it's a ex from over 2 years ago should I belive her?
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