If your partner refuses to get help for their addiction, you should do whatever you can to help them. This may include persuading them to go to rehab, supporting them throughout the process, or even breaking up or moving out of the house if that’s what it takes for them to get help.
You must take care of yourself during this tough time. Resist the urge to contact your partner or stay in contact with them in a way that will hurt you further. Let go and find the peace that you tried your best and may have been able to save your relationship.