Just a thought
What if it turns out that Sid & Riddhima are step-bother & sister? They have never showed who is Riddhima's father and during yesterday's episode from nowhere Sid mentioned his father so there is a possibility that he may turn up soon. Then when Shashank & Padma sees him, they will realize this whole marriage is invalid and should be annulled.
This will leave a clear path for Riddhima and Armaan to be together without hurting Sid too much. Perfect solution for everyone 😊
However, this is an Indian show so I don't think they will ever show this!