Well, for what i know, Aimone (Irene s husband) was first linked to Ileana of Romania and later Infanta Beatrice of Spain.
About Amedeo, i read that he fell in love with Pss Maria Jose of Belgium (later queen of Spain) but he couldnt have a relationship with her since it was against his parents will (Vittorio Emmanuelle wanted her for his son Umberto ) and after a trip to heal his broken heart, he met Anne of France and fell in love with her.