raman is no more in love with shagun...its her betrayal that is haunting n torturing him...
Her betrayal is haunting him yes but he still has a soft corner ,everything of hers is affecting him that is possible only when you have some feelings can be hate or love if he is not in love ,he would have been indifferent to her.
Remember he dropped in drunk at ashok s place before his marriage after meeting mihir in jail