Jefferson would kick him out, Emma would just need to tell her Hatter that the mage was pestering her and that would be it, he'd face a battle just getting near Emma. She wasn't tempted to do it yet, but it would depend on just how nagging Garrett got.
"Here's a tip. I go white blond when I'm dark." And Emma wasn't sure why the change in appearance, but it had happened as soon as she'd accepted the darkness into her, when she'd used it to save Killian, that was it. Her soul was marked.
She didn't bother explaining that she'd always been broken, since she was little and grew up feeling like no one wanted her, like she wasn't anything special. Unwanted and unloved. "I killed someone. I killed someone and I stole a heart, and I ruined a man. How okay should I be?"