It's not uncommon for film stars to fall in love on set. Many of Bollywood's greatest romances took place off camera – Rishi Kapoor and Neetu Singh, Dharmendra and Hema Malini and, of course, Aishwarya and Abhishek Bachchan. It's also not uncommon for one of the two stars involved to be already married. What happens then? Very few of these love stories have a happy ending like the married Dharmendra and Hema, who became his second wife. There's usually heartbreak for the ‘other' woman or man, and the erring spouse returns to the fold. These are some Bollywood marriages that have endured despite rumours of infidelity.