It may be as simple as choosing YES or NO. It may be as simple as STAY or GO. Maybe you simply need to choose between THIS or THAT. Whatever decision you need to make, if the different parts of your brain and heart argue for both sides, that decision becomes complicated.
When your brain and heart are very much in agreement, the simple answer remains simple. Even if the actual decision involves many factors and the ramifications impact lots of folks, a complicated decision seems simple. What seems clearly right, is simply right, regardless of the complications.