Am I wrong for this?

So I was talking to my ex, right. He was the guy who saw the cuts down my arm and said I was a “lunatic.” And that I wanted to be the centre of attention.
So anyways, I saw him at the mall with all his friends and as soon as he spotted me he told me come over there so I did. And then one of his friends asks him if I was the girl and my ex nodded.
They all take off their jackets and showed me the cuts down their arm drawn with a sharpie. And one of them said “Am I like you now haha.” And they all started laughing.
I’m not all that sure of what else happed, all i remember is my knuckles were bleeding, he was knocked out with a bloody nose, and a lot of security guards were holding me back.
Am I wrong for doing that?