My friends are jealous of my relationship and always makes ‘jokes’ like “maybe I should go f*ck your girlfriend” and “I bet he/she is cheating on you right now.” My friends have an extremely deep crush on my girlfriend, so deep that one of my friends used to have my girlfriends bikini picture as his lock screen

Dude they aint friends idk why you still had contact with them tough if you can take screen shots of them telling you that this was a big prank and somehow show it to your girlfriend because i dont belive that they'll tell her after the 24 hours. .

If she doesnt want to see them on her phone print them and go to her house and show them to her or give them to that mutual friend so they can give it to her just make sure they get to her.

Good luck i hope everything works out.