The only way Shok will be able to prove his trust in Aastha, will be going against Niranjan's wishes. To my guess the only time this could happen would be when Aastha will support Jyoti's divorce from Abhay and Shlok will be forced to either trust Aastha or will know about what kind of a man Abhay is. Niranjan will be against the divorce and Shlok will be all pro divorce.
I would love to see a time when Shlok is against his father for Jyoti's sake.