Sentence examples for only friend from inspiring English sources

The phrase "only friend" is correct and usable in written English.
It can be used when referring to someone who is the sole or closest friend of a person. For example: - "She was his only friend, the one person he could confide in." - "Growing up, he had moved around a lot and never had a chance to make lasting friendships, so she became his only friend." - "Despite being surrounded by people, she felt like he was her only friend, the one who truly understood and accepted her."