EXCLUSIVE

Johnny Rotten‘s devastated by the death of Prodigy frontman Keith Flint … and now he’s on a mission to personally help other musicians battling suicidal thoughts.

The Sex Pistols legendary frontman was heading into Monday night’s premiere of the “Punk” docuseries at Hollywood’s SIR Studios … and he was clearly broken up over Flint taking his own life. Johnny tells us The Prodigy singer was a good friend, but he believes he was “left alone” and “destroyed.”

The iconic punk rocker says he’s troubled by what he thinks is a sad new trend — rockers not looking after each other. Johnny has a loving message to others who are hurting, though … come talk to him.

As we reported … Flint was found dead Monday in his home outside London, and his bandmates say he died as a result of suicide. 

Johnny’s taking it pretty hard.