Its very obvious that Arjun cares for Radhika and he could not contain his feelings today, everyone in Birdsong saw it and he did not care. He will not stand around and see Radhika getting hurt, even if it spoils Nandini's revenge plan. With Nandini setting fire to the Mishra business some new turn of events is going to take place. They say karma is a bit#h , I feel Nandini's plan to separate Radhika and Arjun is actually going to bring them closer. Why do I have a feeling that in 10 days its going to be Arjun and Radhika's wedding due to the loss of the Mishra's business.
In the next few days I have a feeling that Sam will come to know of Arjun's feelings for Radhika. But I am sure he will deny that its love, he is still not aware that he is in love with Radhika. If Radhika and Arjun are forced to wed to save her family's business I can't wait to see how they react to the situation.