我々はかつて、恋敵だった。

我々はかつて、恋敵だった。

We had been rival lovers at one time.

我々(われわれ)はかつて、恋敵(こいがたき)だった。

Wareware wa katsute, koigataki datta.

我々 (われわれ)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

嘗て (かつて、かって)

once; before; formerly; ever; former; ex-; never yet; never before; first time; still not happened

恋敵 (こいがたき)

one's rival in love

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: ガ、われ、わ、わ.が-、わが-

Meanings: ego, I, selfish, our, oneself

Readings: レン、こ.う、こい、こい.しい

Meanings: romance, in love, yearn for, miss, darling

Readings: テキ、かたき、あだ、かな.う

Meanings: enemy, foe, opponent