Floyd Mayweather is still trying to find closure after his longtime assistant, Marikit "Kitchie" Laurico, died last March ... breaking down in tears as he praised her as the kindest, most selfless woman he's ever met.
The boxing legend showed his vulnerable side in a heartbreaking interview on the "Pivot" podcast this week ... explaining how Kitchie was way more than just an employee -- she was his best friend.
"Kitchie was the only person in life that I could talk about anything to, that knew my deepest secrets," Floyd said.