Gabriel joined Megan on the balcony pondering how to deal with his realization about her mental state. Megan wanted to die. Maybe not totally suicidal, just not caring about keeping herself safe, taking risks she never would have before. Fighting demons that were too dangerous for her.
Now that Gabriel had made her immortal what would she do? He would need to watch her close enough to be sure nothing happened to her but without tipping her off. Maybe it wasn't as bad as he thought, and he was just overreacting. That was possible.
He knew she wasn't happy and that was bad enough. Gabriel remembered her being excited about the claim and being his. Now she barely tolerated him. If instincts hadn't demanded mating, would it even have happened? He knew it wouldn't have.