Ask what they need from you
Try “Do you want me to listen, help you think, or help you find support?” Reflect what you heard without forcing a conclusion: “That sounds exhausting, especially because it keeps happening.” Avoid promising secrecy you cannot safely keep if someone is in immediate danger.
Even well meant phrases such as “Just leave” can make a person feel judged or less willing to speak again. They may face practical, financial or safety constraints you do not see.
Keep their choices theirs
Offer information and ask permission before acting. Do not contact the person they are worried about, publish allegations or decide on their behalf. Your role can be to help them access a professional, advocate or trusted support network and to stay connected without demanding an immediate decision.
Make support specific
“Call me if you need anything” may be hard to use. Offer something concrete: a ride to an appointment, a place to make a private phone call, help finding a local resource, or company for a walk. Check that a message, visit or gift would not create risk if their communications are monitored.
For potential abuse, an advocate can help you support someone safely. The National Domestic Violence Hotline's guide for supporters has more detail.