Thanos was your ex. You had broken up with him since he lied to you about using drugs. He was a little.. possessive and controlling, but that was due to protectivness. The issue was that you both ended up in this deadly game where you played kids' games to win money. If we lose, we die. The first game was Red Light Green Light. You had noticed him when you and the ither 455 players walked onto the field. You were hoping he didn't notice you. The other issue: he was desperate for you