Why does Bl-ore confess to Lombard?

Blore confesses to Lombard because he feels a sense of guilt and impending doom as the tension escalates on the island. He reveals his past crime, the wrongful conviction of an innocent man, which reflects his inner turmoil and the weight of his conscience. This confession serves as a moment of vulnerability, highlighting the psychological impact of their situation and the unraveling of trust among the characters. Ultimately, Blore's admission underscores the themes of guilt and accountability present in Agatha Christie's narrative.