I don't think Whatever Sid did with Shefali was right.. for the longest time, I have been avoiding these discussions but I do think it's interesting that you guys go to great lengths to prove that Sid would react extremely of Sana did the same things that he did while the truth is that in terms of physical proximity, Sana gets more cuts and yet Sid has let it slide plenty of times..
As for what they would do now, I have always maintained that the reason they were overly possessive is because they couldnt proclaim their relationship.. once committed, the possessiveness would subside with time