Triggered and embarrassed

I live with my man and a close male friend of ours . He (room mate ) likes to watch those cringe worthy videos of violence and raping on YouTube and finds it hilarious . Usually , I try not to pay attention or be around when he’s watching it . He doesn’t know , so I can’t get upset at him for doing it . When I was a child , I was molested by two teen boys at an after school care program . I was also molested by my godmothers stepdad for years shortly after that . Last night , he asked me to watch a couple videos. The first two were some anime shows he’s been trying to get me into . Then , I turn away to take care of my godson whom i have for the weekend . I look back up and he’s watching this animation , and reciting it , where this man is forcing someone to look at him and then he rapes them . The video went the whole nine yards and I couldn’t help but get uncomfortable . It triggered me ... I had to excuse myself from the room , trying to fight back the tears . I went upstairs after putting the baby down for the night and asked my man if I should say something to our roommate about the videos . Just ask him not to watch those type of videos around me because it makes me uncomfortable . I’m genuinely embarrassed that it triggered me , because I’m so used to not being triggered . What should I do ?