
Is your friend group a court perhaps? Why do they need proof?? Do you also need a lawyer and paperwork to talk about your problems??
Even if I doubt that someone is telling me the truth about their trauma, my first instinct is just to keep that to myself and offer them confort. You literally lose nothing doing so.
If they are close friends and neither you and your partner have any history of lying to them the only reasonable conclusion is :
Your "friends" are assholes. That's the verdict, Caso cerrado.
I hope your partner doesn't get let down by this too is an hard enough already to tell ppl and when they can't even believe you is just heartbreaking, I'm hopping the best for them <3
My lover is an SA victim and they vented about their experiences to our friends in hope for validation and help from them, unfortunately they did not get that but instead our friends doubted their experiences of it happening, i dont know what made them doubt about it.. Maybe the story was too complicated, it didn't make sense. They kept asking things for "proof".