Wow i loved what you have wrote👏 it's good to share our own experience. That's why we can able to relate ourselves to characters on screen and understand their own perspectives.
Aryan isn't grieved yet, all his emotions builder as rage inside him. It will destroy him one or another day and he needed to be healed but he don't allow anyone to enter inside his walls until he saw the glimpse of imlie who is breaking that walls on his dream. But on his dream it was very clear, she will be there for him but she will be pulled down by AKT and his family always and that made him insecure and fear of loosing imlie. He wants her because he indeed have feelings for her and he needs to save her.
Imlie - from childhood she was been taunted and also not treated with respect. She accepted her forced marriage as entire life, even though the man she married didn't accepted their marriage and neither he given the place what she deserved but she managed to build a emotional relationship with that family. She itself don't know which boundaries she is crossing everytime, what AKT and his family doing to her. Now she reached a point where she can't love anyone. It's Aru who will break that point and make her fall on love.
Like you beautifully said, until both Aryan and imlie wedded they can't involve on each other life. Now they can. Aryan already made so clear for everyone including imlie that she can't come everytime to handle her ex husband. Once married imlie will question Aryan, break his walls, understand his pain and trauma, will heal him with love.
Now imlie will understand difference two families and two men she married. She also will understand how long she can go now?? If she cross or take sides things will turn ugly. Imlie will see even Aryan stop troubling AKT, he itself will fall on grave problems due to his ego. He now ranting, imlie is only his and Aparna told she will never loose imlie. Both mother and son are so confident on their intuition which will break for sure. AKT can't able to stand that she is moving on her life and neither can handle her success.
In this how Aru and Imlie relationship will be builded, no matter what imlie would be on center but she will get all love and support from Aru. He won't leave her alone. She will see what is to be loved by someone with respect. Intense, attraction, passion, possessive, jealous, insecure, unconditional love she will explore all emotions with Aru and most times it might be overwhelming for her too. Both needs to accept their feelings but it have long way to go. Yes Sundar and Arpita marriage will explode crackers for sure.