Gauti has always been like this. Since the beginning. And he is here to play a game. He cant go around fixing everyones broken hearts. He heard that no one likes him with to he fixed it, its a show, he cant go through the long process of breaking up. He explained it clearly to Di that we cant control what others are thinking but we can control ourself. So its not Gautis fault Di is acting like a long time GF who got dumped. They werent even dating. Di took it to far. But she is a girl and she shed some tears so everyone is supporting her.
And after finding out that Di 12 year BF got married. So i think so took out some of that frustration on Gauti too. If she really was mad as she tried to say on the stage, then she would have never talked or hugged Gauti during the week or while leaving. When someone hates you, you cant even touch them.