She is a drug
He met her when he was a teenager.. from the second they met she wrapped herself around his arm (like a tourniquet), an has been there ever since. She has been there for him for several years. the ending are
1. Stay with her an get closer, results in him in the hospital almost dieing
2. Leaving her, he kicks her out an she is finally gone after about a month
3. Being neutral, staying with her an know that he will never be happy. but nor will he be sad