1) They are capable of letting go of the past : Letting go of the past is the most difficult thing in any relation, not only b/w a couple but b/w any 2 person. Even when u ask forgiveness and move forward for most people something which the other person said or did will always remain in the back of their mind and would eventually resurface in their conversations or actions😕
But SidNi has shown a pure example of letting go. First Roshni, has let go of Sid's lies and I was amazed at their talk on the bench at night ( after friendship treaty, both tesing each other about overacting😆) where Roshni very coolly said she was blind in love when Sid asked why they ddn't catch him when he acted as poor for 6 months😛 There was no grudge, no taunts and no feeling of deception, they have taken such a major thing in their life as just an event and has moved on👍🏼 And even Sid ,let go of the MMS issue and Roshni's accusation the moment she apologized (which most husbands won't have done😕) So, this is one of the strength of their relation
2) Both don't get angry at the same time😆 This is one amazing and funny reason. Usually, when one person gets angry and shouts, the other also gets pissed and shouts back and the arguments gets out of control😆 But in SidNi case its different When one gets angry, the other keeps quiet and that absorbs the anger and cools down the situation😊
First when during the initial days, Roshni used to get angry on things, he used to cool her down by cracking jokes, then when the truth came out and Roshni was angry, he accepted the mistake and didn't get angry on her even when she slapped him and in almost all situations things were under control👍🏼
Then when Sid used to get angry and shouted on Roshni during MMS track and 3 months in Khurana house, Roshni used to keep quiet and didn't argue back😉
3) They value each other's family as their own despite the insults they get there😕
4) Their force of attraction is very strong😳😆 Wherever or how much ever u try to separate them, they do get attracted and be around in each other's vicinity😆
And now after all these ordeals I feel their trust factor also have gone up significantly, so that would be an added factor😊
So, these factors proves that SidNi relation is impossible to break completely and they are a model couple on sustaining relationships😳