@comedyxtragedy: it's not HE who needed her trust, it was HER who approached him first. For someone who could always die by the hand of his own mother, or could read people's ulterior motives, and had only that ability as his most reliable comrade. How could he trust a stranger who approached him while his life-depending dark magic didn't work on them?
That's why she shouldn't spout around about being friends with him, they're on the level of long acquainted acquaintances, not friends. She approached him for her own benefits. She didn't trust him. She didn't even try to understand his situations, like, his real relationship with his family, i know friends don't pry into each other's family matters, but they've been close for 10 years, yet she didn't know his family wasn't good to him, she didn't even notice why he did all the 'tests', she only thought that "oh he's being a bitch again, i'll just go along, for my safety in the future", the same for the first name calling drama, etc. Then when she realized he wasn't her lifebuoy, she immediately cut ties with him. Not to mention she treated a guy she just knows several years way better just because he called her by her name and didn't 'test' her.
She's selfish and self-centered.