How do you deal with a friend who has an evil girlfriend/boyfriend?

How do you deal with a friend who has an evil girlfriend/boyfriend?

Has your friend ever dated someone who was evil, using them, verbally abusive, and just an awful person? Did you try to tell your friend about their evil ways? Did the boyfriend/girlfriend threaten to break up your friendship to keep them from you? How do you deal with someone YOU KNOW is not healthy for your friend?

How do you deal with a friend who has an evil girlfriend/boyfriend?
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