When he found about the fire and came there and saw arpita's memories being burned, he forgot about aarti ... He was just looking at arpi's memories and not trying to save aarti... So, he is feeling guilty and thus is removing all of arpita's memories in bhopal too...
But I really dunno why he is angry towards aarti... mayhe in this huss-puss, he realised his love for aarti when he was about to lose her and is in resisting mode...