He killed her because... He Hated Harem.
... ... ...
"Heh, screaming bi*ch, you get what you deserve." Abaddon said as he walked out of the small restaurant.
"You wait right there. Who allowed you to walk out." Jake growled in a heavy tone.
Abaddon turned back and saw Jake's red eyes staring at him.
Abaddon paid no heed to it and continued his leisure yet lazy walk.
"Aagg, how dare you ignore me." Jake growled like an animal while he rushed towards Abaddon.
Abaddon without even looking back dodged Jake easily.
"Your movements and intentions are too obvious Jake, bye bye." Abaddon slashed the pocket knife towards Jake's throat.
C.L.A.N.G.
And Jake would have really died if not for his father intervening in the fight.
"You ungrateful child, is this how you treat your own brother." Krish Nomed slapped Abaddon.
Abaddon picked himself up together and tried to get rid of the dizziness.