首先你這句話錯在兩個地方,
一是becomes應該是become,因為句子的主語是"我",即"I",第一人稱應用動詞原型.
二是翻譯可以不要太直白,直白有時反而顯得生硬,"和你成為敵人"即是"成為你的敵人"的意思,所以可以翻譯成"become your enemy",
第三是句中which 可省略,I repeatedly done修飾dream.所以最后可翻譯成正確的是Become your enemy is only a dream I repeatedly done.
還可以這樣翻譯:
Being your enemy is only a dream I repeatedly done.這樣比較流暢.
或者用形式主語翻譯:
It`s only a dream I repeatedly done that I become your enemy.