I worship only Radha Ji and to a greater extent. Will I still get god-realization or is it mandatory to develop a feeling towards shree krishna? also, what bhavs are applicable to shree radha ji, all of them?
The topic of Radha Rani is one of the deepest and most difficult to understand. For a brief overview, I would recommend the following 2 minute video: https://youtu.be/lokw_BxmlcI.
For a more in depth understanding, please see the two part lecture by Jagadguru Shree Kripalu Ji Maharaj: https://youtu.be/afbE-kMEwTI.
For your brief understanding, I would say that Radha Rani is supreme brahm. She is one with Shree Krishna. She is His female form; or He is Radha’s male form.