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付き合ってた

was dating, was going out with

→ 付き合う
付き合っ to date; to associate with + て Te-form (conjunctive form) + た Past tense
verb · informal, past tense Rare #28,353
was dating, was going out with A casual contraction of 付き合っていた.
JA: 彼とは大学のころ付き合ってた。
EN: I was dating him when I was in college.
Conjugation of 付き合う
Indicative past
付き合ってた付き合い始めた

誰と付き合ってた？

Who were you dating?

— オールド・ボーイ (2003)

私たち付き合ってた？

Were we dating?

— JUNO／ジュノ (2007)

彼女と付き合ってたの？

Were you dating her?

— 嵐の中で (2018)

昔付き合ってた子と、今夜デートなんだ。

I'm going on a date tonight with someone I used to date.

いや、ケイティと付き合ってたんだよ、ジム

No, I was dating Katie, Jim.

— ミスティック・リバー (2003)

僕のこと好きじゃないのに付き合ってたってこと？

So you were dating me even though you didn't like me?