Is this wrong?

anna

My best friend admitted she sent nudes to my ex today. She‘s never done something like that before and I was really surprised by it. And to make it even worse, he has a girlfriend and my friend knows that. She said it was „peer pressure“ but now she keeps telling me on how they are going to meet up and she’s going to give him a blowjob. I don’t know what to do, help please?