Wrong Feelings
Wrong. That was the only way to describe Kat's feelings. Wrong. That was why he tryed to kill Coop, to convince himself that Coop was weak, and unworthy of his love. However, that seemed to be untrue so far. But when he saw Coop fawning over Fiona like that, he couldn't help but feel jealous. He created the soccer bomb, so maybe Fiona would blow up or something, or Coop would blow up, which would have been even better.
But, the reason he tryed to convince himself Coop was weak, was quite simple: Kat was an alien, and Coop was a human. Coop could never betray his planet like that, and Kat wasn't even supposed to fall in love with him in the first place. He was supposed to prepare the planet for invasion. But then he met him. And if Coop could betray his planet, why on earth would he fall in love with Kat? For pete's sake, the kid had screamed when he first saw Kat!
So, Kat DID hate Coop, in a way. But not in the way Coop thought. Kat hated Coop for being so handsome, so smart, so funny, among other things. If it weren't for all that, Kat never would have fallen in love with him, and he wouldn't be in this mess. Kat hated Coop for living through all the torture he threw his way. Kat hated Coop for being as indestructable as his species. Most of all, Kat hated Coop for hating him. Because if it weren't for that, Kat would have never TRIED to kill Coop, but instead would have dated him. Then maybe these feelings wouldn't feel so wrong.