Leaving the Past Behind

"Killian! What do you even know!" Bianca retorted, feeling a bit humiliated and angry.

Killian held Cordelia's hand and looked at Bianca. "I don't care what your intentions are towards Cordelia, she's my girlfriend. We don't need to be friends anymore." Killian decided on Cordelia.

Because Bianca only brought negative feelings to Cordelia. There was no positive energy at all. It wasn't Killian try