Yeah, same here, but u also gotta think. His demon slayin magic was startin to take over his body and turn him evil. So he had to leave juvia and join the black guild so that he could find E.N.D. and destroy it before he turns full evil, and also to protect Juvia so he doesnt hurt her.
but then again, by destroying E.N.D he must destroy Natsu as well..
yeah, that's also true, but he doesn't know that Natsu is E.N.D Also Natsu may be E.N.D but his demon traits and powers are locked away in the book E.N.D since Natsu is E.N.D but the book is still there... So maybe when Gray finds out, instead of destroying Natsu, who he's known nearly his whole life and was best friends/rivals with, he will team up with the rest MC's of Fairy Tail and go to destroy the book E.N.D, tht's part of my theory...
Wooow shit is about to go down o_o Natsu vs Gray?! This will be awesome! But first Gray has to apologize to Juvia, because I'm still damn mad about the fact that he left her alone.