In the words of Billy Joel, “You may ask yourself, ‘Why did he marry her?’” Well, it’s complicated. But before we get into the details, it’s important to understand that this was not a love marriage. In fact, it was one of the biggest surprises of the year when Kristen Stewart and Robert Pattinson announced their engagement back in April 2016. After a whirlwind romance that saw them date for a year before tying the knot, it was only fair to say that fans would be over the moon at this happy news. They had waited a long time for this day and it seemed like the perfect proposal.

But it didn’t last long. Just a few months later, the couple announced their breakup, which saw Stewart retreat back to her home in the U.K. and Pattinson move to Los Angeles where his current home is. Since then, the split has been brutal on both sides, with Stewart and Pattinson denying rumors of reconciliation and clashing over details of their break-up. Now, it seems, we may finally know the real reason why their union failed. According to a new book, it’s all because of Stewart’s unpredictable and unreasonable behavior.

What is “The Bitter Suite?”

If you have not heard of The Bitter Suite by Chef Duff McDonald, I will take this opportunity to introduce you to a unique book that dives into the psychology of relationships. Not your typical self-help book, McDonald’s tome digs into the complex issues that can arise from a romantic partnership, whether it’s dealing with fights or infidelity. But, as he explains in the prologue, this is not a book about fixing your problems; it’s about understanding them. And if you can put the book down and walk away with a new set of problems, then you’re doing well. It’s also wise to note that this is a cautionary tale, intended for people who already have or are in a relationship and want to better understand what’s going on beneath the surface. So if you’re looking to read something funny or light-hearted, please pick up a different book.

What is unreasonable behavior?

While it’s great that Stewart and Pattinson are committed to supporting each other and are still friends, that does not mean that their relationship will be easy. According to the book, there are red flags that should have indicated to both parties that this was not going to work out. But for some reason, they decided to ignore these warnings and were blindsided by the end result. This happens more often than you would think. As McDonald explains, people in romantic relationships often do not see each other as objectively as they should, putting their own desires and feelings ahead of those of the other person. This is why many fights end in vicious cycles of blame and recrimination. It also tends to lead to infidelity, as one or both parties are afraid to trust the other with their most precious secret.

Why do they keep coming back to each other?

Whether you’re a member of the Kardashian or the St. John clan, you probably know that marriages can be pretty tumultuous, even when they seem to be heading in the right direction. Since the beginning of this year, there have been countless rumors that the couple are working hard to repair their broken marriage. And while there’s probably some truth to those rumors, let’s be honest, it’s more likely that their desire to be together and to make things right again is what’s drawing them back. If you’re fortunate enough to have a lover and companion that you can still believe in and fight for, then keep them close and cherish the time you have left. At least you’ll be able to say that you had some good fights in the marriage department.

So, what do you think? Why did Stewart and Pattinson break up? Was it truly a mistake, or was there another motive behind their seemingly impulsive decision? Were they trying to escape their fairytale, or was it the other way around? Weigh in below, and don’t forget to follow us on Instagram for more relationship advice and tips!