i don't know why but i have a feel that sid's revenge and vansh behaviour is somewhere connected.........
vansh suddenly have change in behaviour and wanting to break his marriage....
sid revenge and also blackmails her and of course will try breaking her marriage too.....
i feel somewhere vansh got to know sid-tapwater golorious affair...he might tracked sid and tells him to break veer-tapwater marriage...since sid too have a old score to settle with his ladylove sure he will agree for it.......
he is trying to break both marriages so that veer-ichcha re-unites again.....because vansh sudden changed behaviour....sid's sudden return....i have a feel that its connected....
but i maybe wrong too....