Sid is such a contradicting character! He says "Koi apne pehle pyaar ko kaise bhula sakta hai..." Yet, he himself has forgotten Tamanna whom he claims to have "loved" and has fallen for Riddhima?! I mean WTH?! that doesn't even make sense...especially not for Siddhant.
Another thing is that if Siddhant is divorcing Riddhima then she CAN be happy now to live with her love - Armaan. She's only confused because she's tied in a knot with Sid for the rest of her life. But if she wasn't, she wouldn't take a second to think. She would run to Armaan. So WHY is she sending Armaan away from her? She, herself is going to be living alone. That doesn't solve any problems...they're ALL going to be living alone. Which doesn't solve the storyline