Ramblings in a diary owned by murderer Brian Laundrie show he harbored homicidal and suicidal thoughts before he killed his girlfriend, Gabby Petito, in 2021 and discarded her like trash. The writings were found by the FBI when the agency searched the Laundrie family home in North Port, Florida, after Petito was discovered dead in Wyoming and before he took his life at a park near his family’s home. The New York Post filed a request for documents related to the case under the Freedom of Information Act. According to its report Monday, Laundrie wrote many of the entries just months before he me…