i understand why you could be upset consider how your s/o had said they wouldnt do those things but still did them anyways. they didnt respect your wishes when they said they would. however, if your s/o really means that they are sorry then just talk to them about how they should use substances in the future and both of your stances on it. there is a way to find a middle ground and for both you and your s/o to understand each others point of view. its a matter of communication with each other and understanding yalls boundaries.