YOU SAID:
I could not thinking you would have left me gladly
INTO JAPANESE
あなたが喜んで私を置いていただろうとは思いませんでした
BACK INTO ENGLISH
I didn't think you would gladly leave me
INTO JAPANESE
あなたが喜んで私を離れるとは思わなかった
BACK INTO ENGLISH
Didn't think you would gladly leave me
INTO JAPANESE
あなたが喜んで私を離れるとは思わなかった
BACK INTO ENGLISH
Didn't think you would gladly leave me
That didn't even make that much sense in English.