Raman and Ishita will not be in love with each other.
They are together only for Ruhi.
If it was not for ruhi today their relationship would have ended by now.
Raman and Ishita's care & admiration towards eachother is misinterpreted as love.
Their cultural differences and Raman's family especially his son and exwife will never let them keep Ruhi's custody for long forget letting them having a normal married life.
For Raman Kumar Bhala, Ishita Bhala is just Ruhi's mother and will remain so whether he likes it or not.