Sevastian, a puppet to Malus and to Alanna, ends up betrayed by both.
Alanna has not betrayed Sevastian; she was blindsided by this, too, and is still very angry with Malus for doing it.
In the end, though, she will betray him, simply because her fate is bound to Luria, and he now hates it. She won't blame him, and will quite sympathize, but it won't stop her from fighting for Luria with everything she has when he comes calling to collect his debt from Malus, and, by extension, from her.
