From Longman Dictionary of Contemporary Englishall in the pastall in the pastspokenFINISH/COME TO AN END used to say that an unpleasantexperience has ended and can be forgottenYou mustn’t think about it. It’s all in the past now. →past
Examples from the Corpus
all in the past• To you that is all in the past, some one else's past, long ago.• That's all in the past.