When they weren't sure if KSG is coming back or not, they tried to bring SR close to each other, then when there was a chance that KSG would come back in time to stop the wedding, they had Riddhima take the poison and change the track. When KSG still din't come back, KW still kept doing his proxy by marrying Riddhima and then when they felt that this is not working for a lot of people, they tried to keep SR away from each other under the excuse of Sid mad at Riddhima for taking poison. When it seemed like KSG won't be back now, they tried to bring SR close and gave us romantic SR moments. But the minute KSG confirmed he is coming back, they started showing Riddhima backing off Sid and that Sid denying her to be his wife in front of his mom.
I am sad for Karan Wahi as he was just used as a proxy for KSG all the time. Now, when KSG is back, the poor guy's character is ruined and who knows will come to an end sometime soon.