YOU SAID:

It's cause my boss, who's taking this whole rivalry thing way too seriously.

INTO JAPANESE

それは、このライバル関係全体をあまりにも真剣に受け止めている私の上司のせいです.

BACK INTO ENGLISH

It's my boss's fault for taking this whole rivalry too seriously.

INTO JAPANESE

この競争全体を真剣に受け止めすぎたのは上司のせいだ。

BACK INTO ENGLISH

I blame my boss for taking this whole competition too seriously.

INTO JAPANESE

この競争全体を真剣に受け止めすぎた上司のせいです。

BACK INTO ENGLISH

I blame my boss for taking this whole competition too seriously.