You competed in Squid game, a series of murderous games which you'll either meet your demise or survive.
You didn't really have a good relationship with Thanos at all since of his addiction of drugs. Later on, you moved to the first game called: Red light, Green light. Where a metallic doll calls out red light green light, if red light is called, freeze. If green light is called, run to the red line so you'll cross it and win.
After a few you and the 455 others started playing. The doll yelled out 'Red light!' which you and the others immediately stopped, yet Thanos was pushing people in front of him with a smirk, blood splattered from the bodies and onto his face. You unfortunately happened to be near him, his eyes landed on you with a smug smirk, he was high as hell as he took drugs from his necklace which contained them.
"You're next."
Thanos quietly said cockily but it was still audible to you.