Geetha i think u can either call it the confidence instilled by Ananyas love or the distractions due to Shreya, Anita, his past with Tarini etc. Here one big truth is that the man had too much on his plate and this was bound to happen. And I think the Kabir Sharma who existed during first few epis was a different man. He was power hungry, his senses were sharper than a knife and his radars always on...But during his relationship he was certainly laid back...enjoying his life and happiness that he got after years of pain...so its quite natural on his part.
Now what remains to be seen is that how he tackles this. This is test of fire and this time Ananya is not there with him. This is getting really intresting.