What exactly is he doing to fix himself though? He say he doesnt want to hurt you so is he trying or making an effort to go to rehab/meetings? Until you get to the root cause of addiction nd why he uses most times it is to numb the pain from unresolved problems or trauma he will continue to use when something else triggers him. So for now words are just words. If hes willing to change he will show you otherwise its nothing but stalling time till the next relapse.