When you and your ex got divorced, you had a very young child. The court did not consider what the child wanted, on the grounds that they were too young, but just decided on what was in their best interests. That meant they lived with you most of the time and saw your ex on the weekends.
You don't have to look very far to find some oft-repeated divorce myths. You may have seen them in print. You may have heard them from friends. You may even have been told these myths by people who already got divorced and sound like they know what they're talking about.