Answer:
Talk calmly to the person. The best time is when they're sober, fully aware and regretful. Calmly and gently pull their attention to how their abuse made them neglectful to things they treasure, or relationships they hold dear. Then let them know you don't judge them, but simply want to bear the burden they're carrying if they'd let you. That you're always there for them to talk to, and you're willing to listen whether they want your opinion or not. And that if they want your help, you're willing to help them trace what's making them this way, and you'll be with them every step of the way if they're willing to get professional help.
Step-by-step explanation: