Rk might feel guilty n he may start thinking that he is responsible for madhus sadness n thats y he may blame her so that she leave him n start new life in her career .He wont blame her frm heart but just to show her that he thinks this way as he may think he is hinderance in her career n happiness n he dnt deserve her .
N after new girls entry he may just pretend to be in love infront of world so that madhu moves on n she might take up acting career also n become a star n after that seeing her becoming a superstar he might feel his dream is fulfilled n he will go away leaving everything n everyone to live their lives on their own .
P.s i know rk is not sacrificial types of hero but he might show his sacrifice also in anger n it might later get revealed by girl or bittuji who may come to know abt this inbetween n then they might tell madhu .This is just my thought
Rest depend on cvs