I think Riddhima doesnt want to get back together with armaan because every time she has there is something that hurt her and thats why they broke up..First it was the adoption and that armaan knew and didnt tell her...and (i cant remember the rest if you rember do tell) and now...Riddhima found out that her boyfriend went with someone else(even though it wasnt armaan's fault)...so basically i think she doesnt want to get back together with armaan because she doesnt want to be hurt again..(even though in the mean time shes hurting our bichara armaan...)...but still..