if that partner is male, double bad idea.... her loyalty to you as your wife will be split with this other man....... spending so much time together "on the business" will be a HUGE mistake. If she won't back down and seek other avenues, I'd call off the wedding. She MUST be totally into building her life together with YOU.....if that partner is female, she will then be "sharing" you with a second woman.... trust me, businness partnerships are amazingly like a marriage. You need to have a relationiship fully dedicated to each other..... with NO "third party" alliances as intimate as a business partnership. All er nuthin, Baby...... if not all, then certainly nuthin.