Shekhar has no right throwing R+R's gun-point wedding in their face, it doesn't concern him and he does need to stay in his limits. This is a matter that only concerns R+R and to some extent Srishti.
But then again he needs to explain to his wife that she shouldn't point fingers at other peoples affairs if she doesnt want someone poking fingers in her own (I mean Sristi did start this with her blaming Ragini for the mess based on assumption rather than facts but there was no need for Ragini to hit so low after that).