No, you don't have to stay in abuse what even. Even the Bible allowed marriages to end if certain things were done that weren't accepted. Even in Bible times not feeding your wife and child for long periods of time was not allowed, and straying wasn't ok either. I mean not committing adultery is one of the 10 Commandments for crying out loud. And clearly for better or worse doesn't mean allowing the relationship to go BEYOND worst and into things that break the commandments like adultery or abuse and starvation. You aren't a slave when you are married, you're a SPOUSE and even the Bible says husbands and wives should be a team and work together. There are also annulments you can get if your wedding vows are broken or you can prove that the marriage isn't real or something, like clearly if the husband is cheating and living with other women, he's broken several of his wedding vows, and if he's leaving the wife and child without food for weeks at a time that proves the marriage isn't legit and should be annulled as well. You're never stuck in an abusive relationship just because you had a wedding to this person.