I think that is bad advice-dont get married if you think divorce is the solution to every problem searock. Ridiculous to mention divorce because they had a bloody row! And dont be putting ideas in her head. She has no reason to believe therr could be another woman on the scene. If she did im sure she would have mentioned that.
OP you and your husband need to sit down and have a calm honest heart to heart. Communication is whats needed here. Both of you need to swallow your pride, forget that argument and focus on the love you have for each other. You and he are a team and you need to work your problems out together. If you cant do that then it is time to seek professional help through marriage counselling