After the task he realized
1. He did not do jack shit in the task
2. Of all people Avinash was supporting Shilpa and even shurtika, while her beta Karan was walking around.
So he decided k ab yeh ronay dhonay ki acting he us k kaam aye gi.
Sympathy and redemption at the same time.
He can support whoever he wants but the problem wahan hoti when he himself doesn't know who he will support. Agar rajat ko karna support tou bolta samne se but he seemed confused. He was too coward to tell shilpa, he will support rajat, or tell rajat he will support shilpa tou bhai saab ki kuch samjh nhi ayi kar kya rah atha rajat ki help bhy dar dar k kar raha tha khulay se nhi.

He cant be sincere to any one sad though .