Dimple Kapadia and Rajesh Khanna's marriage - Rajesh Khanna married Dimple, who was 15 years younger to him, in 1973. People say that this was Rajesh Khanna's biggest mistake. Dimple was very young at that time and Rajesh Khanna stopped her from working in films. He wanted her to stay at home and look after kids. This eventually lead the couple to live separately. It's been said that after his marriage failed his self-destruction started.
Alcohol problem - Rajesh Khanna became alcoholic after his wife Dimple left him. He was fond of drinking earlier also but he was not addicted to it. Alcohol played a very major role in his downfall. People say that even after falling ill the actor never left drinking.
Rajesh Khanna never accepted reality - Even when his downfall started the actor never accepted that he is not a superstar anymore. Rumour has it that Rajesh Khanna once slapped a filmmaker for offering him a role that did not match his superstar status. Rajesh Khanna, who lived in his own fantasy world, once said about a new superstar who later got famous as angry young man, "Aise attan button aate jaate rahenge, lekin Rajesh Khanna ko koi chu bhi nahi sakta, Main kya aise aire gaire logon se dar jaaunga ? Aap log agar sochte bhi ho toh aap ko humara darbar chodna padega."