YOU SAID:
I am a boy and I have a boyfriend
INTO JAPANESE
少年と彼氏がいます。
BACK INTO ENGLISH
The boy and her boyfriend.
INTO JAPANESE
少年は、彼女の彼氏。
BACK INTO ENGLISH
The boy is her boyfriend.
INTO JAPANESE
少年は彼氏です。
BACK INTO ENGLISH
The boy is her boyfriend.
That didn't even make that much sense in English.