The Allure of the Open Relationship and Why Mine Failed

To say I went into it blindly would be an understatement. My now ex-girlfriend—let’s call her Primary—and I clicked on every level, especially the physical. Our sex was passionate, weird and frequent. We made out in public, and in private we explored each others’ darkest fantasies (over-the-knee spanking, anyone?). But one year in, my eyes began to wander.