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疑ってた

was doubting, was suspecting

→ 疑う
疑っ doubt, suspect + て Te-form (conjunctive) + た Past tense
verb · past indicative Rare #39,515
was doubting, was suspecting Casual past form of “疑っていた”; the subject is understood from context.
JA: 彼が嘘をついていると疑ってた。
EN: I was suspecting that he was lying.
Conjugation of 疑う
Indicative past
疑った疑われた疑ってた

僕の話を疑ってたのかい？

Were you doubting what I told you?

— フィールド・オブ・ドリームス (1989)

疑ってたのか？

Were you suspicious?

— オープン・ユア・アイズ (1997)

俺が勝手に疑ってただけだ

I was just suspicious for no reason.

— 別れる決心 (2022)

もちろん疑ってたけど

Of course I was suspicious, but...

— オープン・ユア・アイズ (1997)