People have this serious misconception that a partner will change once they get married. After all marriage is a serious thing isn’t it? So if a person take a vow to love and cherish you it means that they will even if the person was cheating on you and betraying your trust prior to the marriage. No they might not change. It is wrong to assume that and if you marry a person their behavior will suddenly change. If you marry someone knowing that they are being unfaithful to you what motivation is there for them to change. If you accepted the behavior isn’t it telling the person that you are okay with it? Decide beforehand what you will or will not accept from a relationship. Don’t start a marriage on a rocky foundation where trust is an issue. A person who is not dedicated to ensuring your happiness will only bring you sorrow.