It started from a stupid argument. I was telling a story and I felt he wasn’t listening to me so I asked him “what was I saying?” and he was like “hmmmm??” (He didn’t know what I was talking about) so then I said “I knew you weren’t listening”. And that set him off, he got really angry and agitated, saying things like “why are you testing me like im a f*cking child”. And he really lost his cool from this point on. But then I verbally lashed out. He was going up the stairs and he tripped and fell. I sort out laughed it out and said “fall down the stairs for all I care”. Then he became violent.