Oh! Dude!! Let me try to explain you
Sharon insulted Kria in front of the whole college in aid of her Election strategy. But, Rey was absent during that insult session. Swayam had earlier said to Kria and Gang that Rey is going to address the crowd before the election. But, Rey didn;t know about this and unfortunately he got caught in Fire Escape as he was escaping from the girls who were running behind him to accept their roses. Now, When Sharon was insulting Kria, all the time Kria was assuming that it was REY's thought and Sharon is just his voice. So she becomes upset and runs from the Atrium where Dazzlers were insulting her. Rey bechara pyaar ka maara is preparing himself to give a rose to Kria. And they encounter and Kria goes into flashbacks of all that Sharon said and SLAPS Rey. Rey is out of everything that happened in Atrium and is not aware why Kria Slapped him. On the other hand Kria Slapped him because she was assuming Rey made Sharon insult her and now he was giving her White rose for Peace..
Its just the Miunderstanding created by Dazzlers. So after the Slap Rey turns into ANGRY YOUNG MAN because he is really really really mad at Kria for Slapping him. He misbehaves with her in Social.
Bythe way do you know Rey and Kria are the electrorial candiates of GS election. Finally after a lot of Drama, Election happens and Rey becomes GS and riya his assistant as Asst. GS.
This is the story so far, now Rey bossing over Kria is what we all are excited about.
Hope that made sense.