Later , Charlie find Liam high on heroin with groupies . Charlie kick the groupies out , and tell Liam that he 's done with the band . Liam say to Charlie that he , Liam , is Drive Shaft , and that nobody know who the bass player ( Charlie ) is . He go on to tell Charlie that without the band , Charlie is nothing , which spur Charlie to use heroin for the first time . Years later , Charlie visit Liam 's house in Australia and want Liam to rejoin Drive Shaft for a comeback tour . Liam decline , but the band can 't do the tour without him . He criticize Charlie for still using drugs , and Charlie blame Liam for getting him started with drugs . Liam ask Charlie to stay with him for a few weeks , saying that Sydney have some good rehab programs and that he can get Charlie help . Charlie angrily leave , saying he have a plane to catch .