Hi, I think "let bygones be bygones" in Tamil is, very roughly, 'atta camatitam atal camatitam'. Maybe 'amartal' is better than 'atal'. My apologies to any Tamil readers for the awful translation.
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Nadanthavai Nadanthavaigalaga Irukkattum...Ine nadappavai Nallathaga Ennuvoom.... (which is a famous saying in Tamil language, here the first part is Let bygones be bygones.....means "Let whatever happened is happened.....henceforth let good things happen...")