I knew Lionel killed your parents and I didn't tell you. I made a decision (is he talking about not telling him about Lionel and his parents or it's a current decision?) and maybe it was a wrong one but you're the only one who can help me right now.
Top answer
I'd say the decision not to tell about the killings.
— Avangi
I'd say the decision not to tell about the killings.
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Yes, I agree with Avangi about the decision being the one not to tell of Lionel's killing of his parents. The tenses used (I knew....I made a decision...it was a wrong one) also make it clear that it was a decision made at some time in the past.
If it were a current decision, the tenses used would be: I know (or, possibly, I knew)...I have made a decis