YOU SAID:
i have a crush on katsu
INTO JAPANESE
私はカツに片思いしている
BACK INTO ENGLISH
I have unsymised with katsu.
INTO JAPANESE
私はカツと一緒にいない。
BACK INTO ENGLISH
I'm not with katsu.
INTO JAPANESE
私はカツと一緒ではありません。
BACK INTO ENGLISH
I'm not with katsu.
That didn't even make that much sense in English.