You say you have received low increment.
You say the boss is behaving differently (than what he used to be)
You are confused on what to do next.
Being with your boss, you are not able to find whats running in his head. How do you expect people on this forum to predict?
Not to underestimate the answers given by others, but why is it that no one is interested in knowing the core issue. Hema Harish - you need to discuss with your boss on these two issues
a) On why the boss is acting different nowawdays. Is it becuase there is a mistake on your part, or a rectification that you need to make? Or if there is anything to do with your performance, relationship with other colleagues, or if someone has told something about you that needs to be sorted.
b) After this, ask why you received a low hike in salary
Not just you, most of the perople work because they need money to run the show. So if you feel you need to know why you have not received an increment ask your boss about it. Propbably he mis understood an issue and decided that you are wrong until you spoke to him about it.
And BTW I googled, there is no software to guess a Boss's mind. Best software solution is "Ask him yourself"!
Good Luck