The whole point of reunion in fact goes for a toss if they show Dev's infidelity because if he has then it will hurt Sonakshi more. Also Soha and Ishwari can never forgive Dev.
If Dev is guilty then it is a bigger mistake on his part of wanting Sonakshi to confess her love and reunite.
Agreed , you do have a point here...why make her confess when he was on guilt mode..and his past can only hurt her further...same holds good when it comes to his daughter and his mom...they will also feel bad...