My boyfriend [23M] says he likes seeing people’s blood [21F]

So 3 days ago he got home from work and we were watching the news. Somebody was shot and killed and there was blood at the scene, but it was censored. I told my boyfriend that it was scary seeing something like this in our area, the shooting was near where we live. My boyfriend responds, “I kind of like seeing people bleed, I don’t know why!” I did think about it, but I didn’t think hard enough of it.

I got home from work, I was working late. I came home at 1:13AM. I walk into the house and everything is dark and the lights are out, except the bathroom light. My brother has a twin, they’re both the same age. I go into the bathroom and they’re both in the bathtub naked, and they’re facing each other. They filled the water up with red food color dye. Not only that, but the bathroom was a mess with it. It was all over the floor, they had it on their faces, and they wrote words on the mirror with it. It literally looked my someone bled to death.

TL;DR – it was on the bathroom carpet rug, some of it was even stained on the floor. I accidentally stepped in it, it felt gooey or like slime. They definitely mixed it with something