What should I do someone send me snapchat of my girlfriend sleeping with another men?

So I've been dating this really cool catholic girl that's super down to earth while in college for the past few months with no issues. I got 7 disappearing snapchat message of my girlfriend one said sent from emaily my girlfriend name then screenshots&photos of videos of my girlfriend appeared of her giving a bj to someone , riding him and taking back shot's.

I was unable to screenshot or save anything since it all disappeared, im having a panic attack. should I assume my girlfriend cheating? One Image did say cheater emily 2024 boyfriend ben&our school name. have not texted my girlfriend about it. Our relationship is a long distance one since she gos back to vist her family 10 hours away during Breaks but i see her on weekends or during college down times. Should I assume my girlfriend cheating? Or maybe this could be a ex of her or a random person who wants Payback? We been dating publicly for about 6 months with nothing like this Happening before. I check the Profile it says our school name with my girlfriend name at the end. I did message the person all they said was someone said to send me this message that my girlfriend was cheating but person who find out don't wanna get involved or say who she's cheating with. then blocked Me after send one more snap of her taking back shots agin.
Updates
1 y
There is no way for me to see if the photos&Videos are real as the person who sent them blocked me. The photos were set to disappearing in 1 second so I couldn't save any of them. The photos, VIDEOS are 100% NOT AI OR DEEP FAKES. I COULDNT MAKE OUT WHO THE GUY IN THE VIDEOS WAS SINCE HIS FACE WAS BACKED OUT.
What should I do someone send me snapchat of my girlfriend sleeping with another men?
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