Emotional Over Friend's Death

Paddy "The Baddy" Pimblett gave a powerful speech about mental health after his big win at UFC Fight Night in London ... revealing he found out on Friday his friend took his own life.

Pimblett won a hard-fought battle against Jordan Leavitt via submission in the second round ... and after briefly celebrating the victory, his demeanor quickly changed while speaking to Michael Bisping in the post-fight interview.

"I woke up on Friday morning at 4 AM to a message that one of my friends back home had killed themselves," Paddy said. "This is 5 hours before my weigh-in. So Ricky lad, that’s for you."

"There’s a stigma in this world that men can’t talk," he added. "Listen, if you’re a man, and you’ve…