Because they are professionals... why on earth do they need in love just because they have good onscreen chemistry.. ... their careers will be sealed then and there only ..
Alekh and Sadhna also have good onscreen chemistry, but they are both attached to different partners... does that mean people dont love them and people want them to divorce their partners and be with each other...
ALSO Look at Gauri Pradhan, she is one of the prettiest girls on television, but she takes up or is being offered roles only opposite to Hiten...they are labelled for each other...
Kingshuk and Parul will fall in love only if they are comfortable for each other offscreen..even the best of friends, from opposite genders, dont get married because everything does not end in marriage... To maintain a healthy relationship is what counts in life and career.