I have watched the Epi where Shaan throw Asmita out of the house again...when she does her monologue after slapping him, Asmita says to Shantanu : " Tumhara karm jo hai na ek din sabke samne ayega aur tab tumhe meri yaad ayegi aur tab tumhe pata chalega ke dard Kia hota hai"
I think that this sentence of Asmita point toward the fact that maybe Shantanu will discover the truth about Nivi by himself through some circumstances by overhear her or something else without Nivi knowing it and that time he will feel double hurt first because of Nivi's doing and what he has done to make her happy and to make her accept him, she who never give a damn about him and never consider him as her son and second because Asmita tried to warn him and he never listen, he never trusted her instead he kept hurting her humiliating her..That time he will suffer a lot and think about her.
I think we can easily understand how much Shantanu will feel guilty when we saw during Maha Episode how guilty he was feeling when he realised that Asmita was right about Paro and her baby...So just imagine how guilty he will feel when he will realise that all this time he was doing everything for his Nivi Maa who used him, blackmail him emotionally, who make fool of him and his feelings, who betray his trust so many times, who tried to trap him in the false murder charges, who kidnap his father, who tried to kill him when he was a kid...I mean that's soo much to accept for him..that for sure his pain will be far bigger than Asmita's one..I am not saying that what Asmita is going through is nothing compare to Shaan..I am just saying that he will fall from a higher place than her.