[header] How to support someone stuck in a controlling relationship [title] Set up a time to talk in person. [step] Choose a private, safe location. Avoid having the conversation over text or email, as the person's partner may have access to their computer and phone. 
[substeps] Avoid making a big deal of this conversation beforehand, or your friend (or their partner) may be suspicious of your motives. Just say something like, " hey, i miss you.