Well, you ask very good questions.
Marriage is a big deal and I take it that in your culture,
divorce is rare. There are usually signs if someone is going to be abusive and after 7 years you would probably see them. Is he controlling of your activity, critical of you, gives you a verbal lashing if you displease him, ever been aggressive towards you. These would all be red flags. People do change and stressful circumstances can cause someone's behavior to become worse.