Show is all about Madhubala...her ishq and her Junun!
Only after separation Madhu and RK will realize the value of love, value of each-other feelings and they will realize that they are made for each other.
Only after separation Madhu will take step towards becoming the Heroine! Show is all about middle class girl becoming Heroine and that too female superstar.
After Ballu's entry, RK and Madhu will again come close and it will strengthens their bond.
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BUT personally I hate separation...why can't they show some good moments and romance of RishBala for some time before tearing them apart?