My future spouse has been divorced before. How do I prepare to start in a healthy way?

Start by understanding that a past divorce is not necessarily a disgrace, and focus on who they are now and what they learned from that time. Talk calmly about what they learned, without probing every painful detail or comparing yourself with their former spouse. If there are children, discuss your role and relationship with them realistically. Avoid jealousy of a past that cannot be changed; focus on building the new relationship. If old wounds are still deep for them, a counsellor can help. Starting with good assumptions and realistic hopes builds a firm foundation. See counselling.