Bonjour
Tu ne réponds pas = you don't answer
ah, dis-moi pourquoi = Oh tell me why
this ain't au revoir = ce n'est pas un au revoir (It's not a good bye)
together voilà = ensemble, voilà
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I don't really understand the last line as nothing comes afterwards... It's not very grammatically correct ....
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However I hope this helps ☺☺☺