What you guys think is Dev make a big plan for taking revenge? Because Maan kick out him from KM & KC. He married with Geet for money. But what I feeling actually he love Geet not NT. He like NT and married her but after marriage he realized that NT married with him because he is rich person and when she knows that everything is only MSK not Dev then she start mentally torture every time. When he meets Geet he like her beauty as well her soft caring nature. That's the reason after get married when he stay behind with Geet and NT came to that hotel where both stay Dev slap her. He always remember Geet in Canada also and in Delhi also. When he saw Geet with Maan may he jealous again because again Maan get what ever he wants. This is just my POV don't throw any chhaples and tamatar.
I was right Dev has some kind of plan in his mind. I have some options -
1) I think he wants get realized to Dadi & Geet he changed & he is good person now.
So both will take his side in any critical situation. - He succeed little bit in
that.
2) Second thing is - he wants separate Maaneet. For his this mission is in process.
Separation first step done guys