I have to talk about Jenni here (I can't help it). Riddhima smiling widely seeing her old friends but there was still so much pain in her eyes and even in her voice. The way she sniffled when she said 'Tum bilkul badle nahin na Atul'.....that just broke my heart. She said it with so much emotion! It got really overwhelming for me personally seeing Riddhima like that.
Just reminded me of that song...
'Tum itna jo musku rah rahe ho, kya gham hai jisko chupa rahe ho'
The fact that she wants to forget Armaan means she will never be able to.