After Geet tells the truth to maan he will recede from her for some time and since now his darling brother too has decided to tell him the whole truth he will realize that Geet was not wrong and it was Dev and nain tara who have actually ruined an innocent life and now she is pregnant with his brother's child.
He would have by then realized the agony geet must have ine through and now that she is carrying Khurana khandaan ka bahccha he will take it up on him to take care of things for her and the baby. He will then support her whole heartedly and with all his love.
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