YOU SAID:
I used to be the cool guy, now I'm not.
INTO JAPANESE
以前はかっこいい男でしたが、今はそうではありません。
BACK INTO ENGLISH
He used to be a cool guy, but now he isn't.
INTO JAPANESE
彼はかつてはかっこいい男でしたが、今はそうではありません。
BACK INTO ENGLISH
He used to be a cool guy, but now he isn't.
That didn't even make that much sense in English.