Parthiban always involved with his co-actress like sita, preetha vijakumar, Aswini and Sangeetha was the rumor from saregama pathanee and reached peak during Pullaikuttikkaaran shoot.. this is major reason for sita breakup with him..
I think Shalini dated a producer's son of mollywood and she was a drug addict before allaipayuthe.This I read long back.Dont know how far it is true.
i have also heard that shalini had a crush/liking on Vijay when they both acted in kadhaluku mariyadhai movie.. i guess sometime soon after that Vijay got married..