Maybe Radha gay from the start
I just don't see someone in her position who does this because her man does not pleas her. Either you liked women from the start and suppressed it or you are just trying something new. If she liked women from the start it is she whom tricked her husband into wedding her to cover it up.
Also if she went as far as she did with the other gal one would think she should have said something about her desires and suffering to her husband. It would have been a much easier risk then taking the path she did with her lover.