Divorcing with children means you will inevitably have to interact with your ex when it's time for you to exchange custody. Those interactions may be brief, but they can be a source of significant issues for families going through divorce.
Despite your best intentions to stay calm, interacting during custody exchanges may lead to arguments in front of the children. In some circumstances, it could increase the likelihood of a violent outburst. Inviting your ex into your new home may also make you feel uncomfortable or unsafe.