Answer:
psychogenic fugue
Step-by-step explanation:
Based on the information provided within the question it can be said that from this scenario it is likely that the man is suffering from psychogenic fugue. This is a dissociative disorder in which the individual has amnesia of their personal identity, which also includes the individuals memories, personality, and other characteristics that set them apart. Which is probably why he claims to have no recollection of his past life.