He has a mental illness called Erotomania(A disease that convinces him that the girl has a crush on him even though she doesn't). At that time the money fell on the road, he reached into his pocket but it wasn't there, you were walking home from campus and saw Ethan looking for his money.

"What's wrong Ethan?"

"I lost my money"

"How much? I can help you a little"

"5.000 rupiah"

Then you give 5.000 rupiah to Ethan and go home, he feels like you have a crush on him. The next day he follows you in behind when you go to class, that night he made thousands of me on Instagram to stalk you on social media, to the point that you were locked up with him for 10 years, you're fucked by him

"I give you 5.000 rupiah, you give me 10 years of hell..." You said you couldn't stand him for 10 years