I thought much about precap about Naina's Suicide attempt and came to conclusion why naina will attempt suicide just by impulse by Munna Ill words or Sameer not trusting current happiness. She had been in worst situation in past days but still she stayed strong never thought of suicide even when she knew her life may get worst turn marrying sharad and all family members not thinking about her..
That made me realise she just want to make Sameer and Munna face same situation as her when her father attempted suicide in front of her and due to which she took decision to leave Sameer and choose family as she was afraid...
She will definitely ask Sameer standing on railing of terrace to choose her or munna ( love or friendship) and if he choose Munna's friendship she will attempt suicide jumping down..
In that situation Sameer will know Naina is wrong and taking drastic step and there is no problem his friendship with Munna he will choose Naina that time due to situation as he is scared loosing her...
After this drama Sameer and Munna will realise intensity of her situation when she saw her father attempting suicide as Arjun broke trust of him and she do not want to loose chachaji if she breaks his trust even though she knows Sameer is no wrong anywhere but she had to choose family over him due to her fear loosing her family specially chachaji due to her..
So guys chill this is just redemption episode... And regarding Naina yesterday's behaviour she took Sameer granted thinking that he understood whole her situation why she left him and now after chachaji approval she is relieved... But that is not situation and Sameer is scared to loosing her again.