I'm genuinely so confused..

The ending of AIB confused me SO BAD. At first the stories that the queen of hearts were telling got me good, the vr, the illusions.. and then the one of Arisu's friends getting hit by the car was so realistic. But then there was the whole therapy thing.. then the meteorites? Now they're all ended up in the hospital? So was that really what happened and it's all in his head, or did the game happen and when it ended it wiped his memories and sent him back? Please explain 😭😭🙏