Pros and Cons
Hermione thought about it.
A lot.
She was accustomed to Severus' constant company and enjoyed the partnership they had. She presumed Severus didn't mind her company either.
Hermione loved being a teacher at Hogwarts and worked hard on Severus' research projects.
She didn't want to leave him. If she did, where would she go? There was no one else she could see herself marrying in the future. No one was as intelligent and interesting as Severus.
And what fate would he be left with?
But if she did stay, there would have to be children.
Children in a loveless marriage.