Why Advay being like this?

This story starts in Chennai. there was a boy falled down at the junction at night 8 PM. And he was a drugs user. In that time a girl coming across that junction with her husband that girl name is anjali. she saw that boy and shocked because he is her friend Advay, then she told to her husband that he is her friend. anjali was married to keshav Mumbai boy and settled in Mumbai during the vacation anjali come to Chennai will see her family and friends. In that time she saw Advay in this situation and take him to his home. but anjali is very shocked because Advay was her school, college friend and her close friend and her family friend too. In their school, college days Advay was a decent and very polite student. professors always appreciate Advay for his good manner and spot him as an example for other students. that's why she was very shocked and tell to mr.sharma who is Advay's father "uncle I know Advay is in a big pain we can't change that but i didn't expect Advay being like this, I am so sad for him". sharma replied to anjali "what we can do ma it's all are my son's fate " he felt inside bad..