You are right Monica.It was wrong of her to use his mother too.If he had done something similar and involved her family,would she ever forgive him?She literally played with their feelings.
Even he had instances were he could distrust her, but as you mentioned ever since he started loving her,Aarav never suspected her again.Even when they were at her house and it was almost evident that there was something more to Suchi's invitation,while re-confirming with her mother regarding Pihu,he said that Suchi would not lie to him.