obsessligation
It's when your obsession becomes your worst enemy. It makes you do stupid stuff. People start to laugh at you. You're like a train that can't stop running.
He got so obsessed with his crush that he asked her to be his girlfriend in front of the whole school.
She got obsessed with her diet. Now she skips lunch and eats a salad for dinner.
He got obsessed with his video game. He even started sleeping in the living room.