Women who go silent when something upsets or hurts them, are often experiencing a coping mechanism called EMOTIONAL WITHDRAWAL. It's not that they have nothing to say, it's that their system learned that silence is safer than being misunderstood. Instead of expressing anger or frustration, they hold it in.
You are allowed to leave a relationship simply because you are unhappy. You do not need a list of horrible things to justify it. You do not need bruises, betrayal, or a dramatic final scene. "This is not good for me anymore" is a complete sentence. So many people stay too long because they are waiting for permission to go, waiting for the situation to get bad enough that no one will question their choice. You do not need anyone's approval to protect your one life. Wanting peace is reason enough. Wanting better is reason enougn. You are reason enough.