Ok, now a review with spoilers. My theory is: Isabel doesn't exist. She is the human representation of the drugs. And once you have this is mind, all the alleged non-sense starts to make total sense. She appears when he is desperate, offering some magical help, they suddenly get close, because of her he loses his phone, his money, steels a car, ends up living on the street, going to dangerous places, having trouble with the police. She takes him to that dream world. People are debating which of the worlds are real, but the "perfect" one never existed, he was allucinating and woke up when he listened to his daughter.
He even suggests that Isabel kills him, but when he is determined to stay in the reality, she disappears.
Isabel is the drug.
He even suggests that Isabel kills him, but when he is determined to stay in the reality, she disappears.
Isabel is the drug.