@ shamil..u are wrong in assuming that Sid dsnt know how much Armaan loves Riddhima..Remember the diary scene,when Armaan reads out from a blank diary and tries to convince Riddhima that all that has been written by Sid..?? That day Sid himself said ,''tum kis mitti ke bane ho?'' how can u go to this extent of loving some1..Armaan replied i can do anything for Riddhima's happiness and even she can NOT stop me..the magnitude of Armaan's sacrifice itself is a proof of how much he loves Riddhima..he dsnt have to slit his wrist or commit suicide to prove any1..its evident..and Sid knows..but unfortunately Sid's love for Riddhima dsnt allow him to look beyond himself..FACT!