I let a stranger hump me at a concert while my bf was there

Back when my boyfriend and I [then 19f] first started dating we went to a concert, packed, hot, and loud. That kind of chaos where people are pressed so close together you can't tell whose sweat is whose. I was holding his hand. He was totally focused on the music. I was... not.

At some point, I felt someone come up behind me. Close. Too close. At first I thought they were just trying to push through the crowd, but then they didn't move. Instead, they started grinding against me. Slow. Deliberate. Right against my ass.

I stiffened. I looked at my boyfriend, he was still singing along, head turned toward the stage, clutching my hand like nothing was happening.

And

let it happen. I should've moved. Should've said something. instead... I leaned into it.

Whoever he was, he knew what he was doing. He rocked his hips against me, pressing his cock between my cheeks like it was nothing. Like I was there for it. No words, no hands .. just filthy, heated friction through my tiny skirt and our bodies and music pounding in our chests.

And I got so wet. Like embarrassingly soaked. My panties clung to me, and every roll of his hips made it worse. I couldn't breathe. Couldn't think. My boyfriend's hand was right there in mine and I was literally letting a stranger grind his cock into my ass in public like I was his.

At one point, I swear I felt him twitch. Then-warmth. Wetness. Right on my skirt. He fucking came. Against me.

he stayed pressed against me for what felt like an eternity until I came too. Quiet. Shameful. Right there in the middle of the crowd, my thighs trembling and slick, clenching around absolutely nothing. No one saw. No one had to.

I didn't even turn around to look at him. He disappeared into the crowd like it never happened. But later that night, when we got home, I took off my skirt and... yeah. There was cus. His dried and crusted onto the fabric.

Does this count as cheating?