That is not the topic for this post. I will just draw parallels to how these characters behaved during similar situations... that is the discussion point..
Dev vs Vicky
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Dev did not reveal to Ishwari or Family until mamaji told him that Ishwari already knows about him and Sona
Vicky did not reveal the matter either to the families - i think the reason why he did not reveal when gkb called him home to eat halwa was because he didnt want to get stuck answering their questions. so He wanted to go and get elena home and then reveal the truth
Dev followed sona after breakup and did things to make it difficult for sona to move on and also spoiled Ritwicks career (i hope temporarily)
Vicky did not let Elena go either ... he did it in his own way and he convinced elena
Sona vs Elena
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Sona agreed to get married to ritwick and no one forced her ... Asha asked her again and again .. she kept on hiding her feelings. Then she just ran to Dev and took him home on her engagement day. She caused pain and humiliation to not only her own family but Ritwick's family too.. The saving grace was that she immediately realized that she did a blunder and repented and asked for forgiveness.. But the damage was done.
Elena broke up as sona didnt want her to date Vicky but she couldnt stay away from vicky (I would not judge if they love each other or not. atleast they claim to love each other just like Dev and Sona did).. she eloped and got married ... ended up hurting her family . The only thing that is different is Elena doenst feel remorse or bad that she hurt the family where as sona felt bad.
I guess this is a good starting point.. lets the discussions begin.