If there is one thing about Aditya's character that the writers have kept consistent is his honesty in portraying his emotions, whether his decisions based on those emotions were right or wrong, that is a separate matter. But he was always honest with his emotions. And the only person to whom he showed his real emotions to is Imlie. He landed up hurting Imlie a lot because of that but he did not hide whatever he was feeling from Imlie, ever. That is why, if writers keep his character consistent, there is no way to fit Malini back in his life. This was clear from the moment he realized his true feelings for Imlie. Even after leaving Imlie in PD, he tried for a day or two to be with Malini but he just could not. And when he told Imlie that he tried being Malini's husband, it is not only about coming back from PD trip 3, it is also the period between PD trip 2 and 3. He tried being the man for Malini but he just could not stop caring and growing more feelings for Imlie.
For 140 episodes, what Aditya has been feeling, whether it is happiness, guilt, denial, anger, love....it has been very clear to the audience. And Aditya has only taken actions based on what he thought he was feeling at that time. Even marrying Malini was because he felt obligated, was in denial about his 1st marriage, but still on the day of the marriage, he knew he was hesitating but then his father came and talked to him and he decided to go again destiny. And not in one of his marriage ceremonies was he really happy. But he still went ahead with marriage because at that time he thought he was doing the right thing. And he tried to be loyal to Malini. But when he realized his true feelings, he could not fake loyalty with Malini. That is just not him. He will face punishment, he will face hatred from his family, he will even accept if Imlie wants to get separated from him for hurting Malini, but he still would not be able to fake it with Malini. That is how honest Aditya is with his emotions. So let's see how he handles Malini's suicide drama.
The thing is not even his love for Imlie can force him to be with Malini. He tried for few days but failed. He will not try again, not even for Imlie.