Especially when she came out to him and he was there for here and supportive. But before that, there were times she hated him and she's seen him at his worst.
She was appalled by him when he called out Claudia at the MC and for months after Claudia was dead, she called him out for being abusive to Claudia. Then there was the time Keifer beat her and Sonny was there and she was scared he would kill him and lost it on him. And then there was the time Sonny planted a bomb for Johnny and it nearly killed Kristina and she hated him for years after that. There seems to be a re-write right now, as if Kristina never knew this side of him.
It just seems to me that this is headed for Sonny having nobody in his life and him having a complete breakdown. I mean, we've been here before with Sonny off his meds or before being diagnosed him being manic and erratic. They have to go further this time for it to be different.