is this American trustful?

is this American trustful?
this Amreican is one of my friends,we
haven't contacted with each other for
10 years.it is bolt from the sky that
he sent me a letter a few days ago,
saying his situation is not good,
his wife of 24 yeas left him and
swine flu nearly kill him,he also
said that he owes me a lot (for
I had lent him 5000USD,but 1500USD
is unpained by him)and he wants to
send it back to me.but I haven't
received his response after writing
to him.is this kind of man worth
trusting?