Translation:I have a good relationship with my friend.
Chinese only uses plural 们 for added emphasis with nouns. Most of the time it doesn't indicate singular vs plural.
What would that be? 朋友们?
When you are being asked about what your relationship is like with your friends.
When your therapist says that "maybe it's YOU." of course. I say this to her nearly every Saturday.
Pretty sure this should accept "My relationship with my friend is very good".