Khushi is the only other person in his life except his Di who means alot to him!
And the heartbreak he got after knowing that both of their happiness lies in one person(shyam according to him)..
He just can't deal with this fact. He doesn't want to love her but his heart doesn't care about what his mind wants. His heart wants her to be his only but his mind knows thats not possible because according to him she loves shyam.
All his conflicting emotions are making him react this way. Passionate at times and angry at others.
Inside his heart and his mind is in turmoil.