this is a big question for now because he said that he loves dev and he even proposed to her but she rejected him so why will he propose her again? according to spoilers he proposes her in front of his friends and she again rejects him, his friends make fun of him and he feels insulted so he plans to revenge her, you know friends i think when previously dev rejected neil it was because of rajat and neil knew it because they were getting engaged but when they again became friends, got together to unite anuraj, neil could have got hopes that now dev likes him so she will not reject him but she does and so he feels insulted. i think he will plan something to revenge because that was how his character was potrayed in the beginning- a spoilt brat. but i also think that he plans to revenge but as dev also falls for him and they get closer, its their feelings winning and not his revenge, they will be happy together but when dev will realize that neil wanted to revenge her then she will start hating him and he will behind her apologizing, but the more melodramatic scene can be that neil completes his revenge and leaves dev heartbroken, dev is becoming a mature character but after all this she will become more mature and there can be a complete transition of her personality, so after a series of heartbreaks the circumstances will make them bump into each other again and again and eventually we will get deveel in love!