The problem is that since we are mutual friends, mostly every time I hang out with my friends, I have to hear about him, and that sucks after trying to get over him and having been hurt by him. My friends don't know what he did, because the whole time we were "dating" (if you could call it that) I kept it under wraps and presumably so did he. So no one really knows that I'm secretly carrying this burden, and I don't want them to know because I'm not trying to start any drama, and I don't want to spoil their friendship with him with my issues. Plus they're new friends (also just met them last semester), and I feel it would be too much too soon to be like "ummmm can you never talk about him around me? Thanks."
So what ends up happening is me nodding and grinning and bearing it whenever they speak about him (because they assume he and I are friends and that I'd want to hear). It's gotten to the point where I've heard about his sexual endeavors through them, and it's getting to be a little too much to handle. I don't want to stop hanging out with them because they're very cool people, yet hearing about him constantly and what he's doing stunts my progress in getting over him and puts me on edge when I'm around them. How do I handle this?