Divorce can happen for many reasons. Some couples just don't get along. Some drift apart over time. Some see a divorce triggered by a key event, like infidelity or the development of an addiction.
Are you thinking about birdnesting after your divorce? This is an arrangement that means you and your spouse split up custody by moving in and out of the home, while your children stay there. For example, if custody changes every other week, rather than sending the kids to your spouse for a week and then getting them back, you'd just move into their house for a week, while your spouse lived elsewhere, and then swap with him or her at the end of the week.