YOU SAID:

My girlfriend is so stupid, she drinks milk at 8 pm and she threw up at my birthday party, so she is not my girlfriend anymore.

INTO JAPANESE

私のガールフレンドはとても愚かで、午後8時に牛乳を飲み、私の誕生日パーティーで投げたので、彼女はもう私のガールフレンドではありません。

BACK INTO ENGLISH

She is no longer my girlfriend because my girlfriend was so stupid that she drank milk at 8pm and threw it at my birthday party.

INTO JAPANESE

私のガールフレンドはとても愚かだったので、彼女は午後8時に牛乳を飲み、私の誕生日パーティーでそれを投げたので、彼女はもはや私のガールフレンドではありません。

BACK INTO ENGLISH

She was no longer my girlfriend because my girlfriend was so stupid that she drank milk at 8pm and threw it at my birthday party.

INTO JAPANESE

私のガールフレンドはとても愚かだったので、彼女は午後8時に牛乳を飲み、私の誕生日パーティーでそれを投げたので、彼女はもはや私のガールフレンドではありませんでした。

BACK INTO ENGLISH

She was no longer my girlfriend because my girlfriend was so stupid that she drank milk at 8pm and threw it at my birthday party.