Because he unethically proposed a married women now and she rejected him thrice and also reminded him about his commitment for Ar and Ruhi! And she very clearly confessed her love for Abhinav so I think she Is no way interested in her ex’s life !
yeah audience def doesnt know abhi will land with which sister, but ak was certain from start abhi should be married to arohi eventhough he proposed to her then , even now ak is certain abhi should marry ar eventhough he still proposed to her now .
AbM ‘s mamma wants him to get married to Ar and have a happy family with Ar,Roo along with Abhir and he is ok too with that proposal and got engaged to Ar!