Yes, there are some:
"περασμένα ξεχασμένα" and "ό,τι έγινε έγινε". These mean: let bygones be bygones, past history, water under the bridge.
You can also use:
δεν πειράζει : no problem
μην το σκέφτεσαι άλλο : don't think about it any more
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.