Agree with you too Lalitha and Ravichitra.
Apart from Ram having his own insecurities, Priya has hers too. She really is afraid of rejection, especially after her experience with Ashwin (Priya really did love Ashwin, she admitted it to her Dad). Having experienced a first love and recognising how lame and immature it really was. She believes that the feelings that she has for Ram is true love – intensely strong and all consuming. Ram did not respond by reciprocating her feelings when she provided him with the opportunity to do so, which leads Priya to believe that she is indeed his good 'friend' and that he is fulfilling his responsibility as such. She is fighting an internal battle, her mind knows that Ram does not love her, so she is forcing her heart to understand this, and therefore the frustration is inadvertently compelling her to act irrationally displaying uncharacteristic behaviour. By not giving him the opportunity to speak means not hearing those dreadful 'friendship' words that she has already conditioned her mind with.