Was I used for sex?

I’m trying to figure out if I was just a hookup to this guy or if something else is going on. For context, I’ve met this guy twice in total, and he’s actually a pretty big YouTuber in my country. Both times we hung out, his friends were present (he tried to meet me solo once, but it didn't work out).

The first time we met was about a year ago. It was basically a chill house party vibe. We played Yu-Gi-Oh, and I brought some of my Switch games. We ended up playing Tetris and I completely destroyed all of them lol. They were super impressed by my skills and it was intense but really fun. We also did some drugs outside; it was cold and he could tell, so he lent me his jacket. I just went home at the end of the night (he later told me I couldn't sleep over because of something involving his ex or his son).

Cut to a year later: he asks me to hang out again and I say sure. He literally paid €300 for my taxi to get there. When I arrived, I could tell he and his friends were totally drugged out of their system. I just drank alcohol, but we had a ton of fun playing games and laughing.

His friends were super sweet one even hugged me and another told me I was cute. They seemed to bombard me with questions like an interview, but because I already "knew" them from watching their videos, I felt safe and wasn't too scared.

Me and the guy who invited me literally held hands while we went shopping with everyone. We stayed up until the sun rose. Later, when everyone was getting tired, the guy suddenly picked me up bridal style and carried me to his bed... and yeah, we did it.

The next morning, his entire vibe changed. He was super weird and very distant, like huh? The funny part is, I didn't even have any relationship objectives with this guy. I would have been totally cool just staying friends and hanging out like we did before, but he made it so awkward for absolutely no reason.

I still had a lot of fun with his friends that morning though, and one even followed me on Insta. But the guy who invited me was just weird the whole day until I left.
I even texted him a few days later just being normal, but he just gave me one-word responses??

Was I just used for sex? I'm so confused.