Actually all three of them are wrong and right at the same time depends on what you think. Aditya has never been emotionally empathetic guy. He has very direct approach to life and relationships. Malini is his friend turned gf as there were no other girls that really interested him so mistook whatever friendly affection he had for love. It happens this is reality you can fall in love with anyone anytime. Affection can be mistaken for love. Imlie did catch his attention in PD. Nobody will like it but you can't control your heart whom to love. He made mistakes hiding truth from Malini and family. But once truth is revealed he was ready to bear any punishment and move forward. Same with imlie before Aditya she considered Malini feelings even though she has fallen in love with her husband still she held back asked Malini again and again if it was alright to be with Aditya. Malini herself gave her push to be with him starting divorce and all. If you have watched episodes from start you will see there isn't really any romance between adilie until Malini actually filed divorce. Until then it was all angst and playful companionship. Malini had a chance to punish Aditya but she decided to be mature and understanding then encouraged them to go ahead I am having for you but still expecting Aditya to be at her beck and call. Giving her attention when he paid more attention to imlie that triggered her. Malini is now only realising what was Missing in their relationship of 7 years ahe sees them together and know that Aditya was never like this with her. And that is more hurting to her. Mostly I see her like trying to act like imlie to get Aditya attention. The more Aditya fights for imlie more she is hurting and acting out.