He didn't have to let her go. He could have called out to her; tried to reason with her to stay. Only problem was that a part of him didn't want her to stay. That part of him couldn't even bare to look at her.
But she did love him, at least he knew that wasn't a lie. That his feelings for her were reciprocated.
He felt a hand lay itself on his shoulder. He turned to see J'onn giving him a small, sympathetic smile.
"I know how it feels to lose a loved one," He replied as the Lantern shrugged off his hand and began walking back to the manor.
John frowned as he brows furrowed, "I didn't lose her."
He knew that someday she would come back. He just didn't knew if his heart would be able to take her back.