The secret has been just revealed to his mind by his heart. He is got a hint of what's happening in his heart, he is got a hint of why couldn't he resist beaming as she got back to concius. Now the secret is just between his heart and mind, he was in disbelief upon knowing this secret and walked away avoiding her as she approached, couldn't stop himself from stealing glances a few minutes later.
It's not love yet, no.. it isn't that deep yet but it's something, it's something that is just felt and couldn't be put into words, it's a little secret that can't be shared with anyone and can't be contained within either.
P.S: you all will witness Shivaay going cute cuter tonight.