I think Radhika feels betrayed by the PB parivaar when she said defensively "mujhe koyi farak nahi padtha aapke parivaar mujhe Devi samajthe ya Kulta" She does care but feels betrayed that nobody came to her defense.
Unless someone backs her up there is no way she can prove she is married to Dev. She can confide in Dev but she knows he will go ballistic and do something irrational like he suggested today(taking her to Delhi and telling them the truth) and she will be called a homewrecker by the evil trio of amma, devki and Vish.
Keshav the knight will be there next week, I just hate that track.