They can't live without each other! They couldn't even concentrate in their form. All the time only thinking about how to evade the presence they can feel through the damn walls. It's not a "I want to see him" it's a "I mustn't see him"
They were soo out of control! They're each other's stability, both to restrict and release their strength. They can not BE without each other anymore!
CH 39 AKA "They come in a set, Do not separate"