Shantanu never ever said he had any physical relationship with Aishwarya. This is very very clear in the serial till date. Infact if there is any virginity test for him this case would be closed.
Sharvari clearly told Shantanu that he did not tell her about Aishwarya. When Sharvari lived with Aishwarya and realised the manipulating ways of Aishwarya, the blackmail et al, the clear headed Sharvari did not fall in Aishwarya's trap. Infact Sharvari realised Shantanu was emotionally manipulated and trapped and she decided to support Shantanu. Sharvari did not do what she did because she fell blindly in love with Shantanu. Infact it's a very clear headed gradual movement towards supporting the righteous.
Circumstances for Shantanu got favourable even in this trying times. Lucky guy in a unlucky situation.
As far as Sharvari's MOM , I don't know how people deal with such massive ego. She will come around.
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