God would not want anyone to stay in an abusive marriage. Many people use the bible as an excuse not to look out for themselves. Whether you believe divorce is a sin or not the truth is no one is without sin. Everyone to some extent is a hypocrite. We "cherry pick" which rules we want to follow. I'm not saying it's right or wrong. I'm just acknowleding that it's true.
Eclesiastes 7 20 : "For there is not a just man upon earth, that doeth good, and sinneth not."
Life is a personal journey. You are responsible for your happiness! You set up your own "deal breakers" and ideally you would have discussed these prior to saying "I do". No one is "stuck" with anyone. God will forgive you for marrying the wrong person and divorcing them. A divorce is nothing more than one or both people reaching the conclusion that a mistake was made. None of us are perfect!