Public Searches For Reason
Most of the rumors claimed Brad Pitt was an alcohol addict and a heavy drinker. Some sources even said he faced drug abuse. People speculated that Pitt and Jolie faced problems and filed for divorce. These could be the reasons.
A Suspected Affair
An affair could be another possible reason. Some speculations claimed Brad Pitt had an affair with a famous person he was working in his film Allied, Marion Cotillard. These fraudulent rumors finally were denied, leading people to think of other options as to why Jolie-Pitt filed for divorce suddenly.