<human>: I'm not technically dating my partner, it's more of a FWB arrangement that has lasted for a little over 3.5 months.

We were having a movie night when I noticed he had "A Serbian Film" on his shelf. I made a comment about seeing it as we started a comedy. All through the movie, he kept asking me questions about "A Serbian Film"; saying he really enjoyed it, it was on of his favorite movies, etc.

I said it was a movie that I'll only watch once and some scenes were unnecessarily gore-y. I tried to direct his attention back to the comedy we were watching but he insisted on asking me more about "A Serbian Film" describing the newborn scene and the dead person scene and asked me if I had seen "120 Days of Sodom" or "Cannibal Holocaust". I assumed he was just into gore horror movies.

We had started making-out when he whispered in my ear that "A Serbian Film is kind of hot...You'd look good chained to a bed...do you want to reenact a scene or two?" I pulled away in shock, and said no, and made an excuse to leave. I can't imagine why anyone would want to reenact a scene from that movie, seeing as all of the sex scenes had either rape, pedophilia, or necrophilia in them.

He's called me twice since I left and I haven't responded because I don't know how. I met him through my roommate and he didn't have many friends or leave the house partly because he relocated here and partly because he's asocial. He just got out of a nasty depressive slump and since he only has my roommate and I in his support circle I don't want to desert him completely. I've never known him to be hostile (aside from self-harm) but should I be worried?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: My FWB asked me during a heavy make-out session if I wanted to reenact a scene from a movie filled with nothing but pedophilia, rape, and necrophilia.