before you gang up on him,try and just get him to see the truth for himself...like a book on filipino family culture,so that as hes already seeing her she would want him to meet the her family already!.
also say that he as a friend in the phils who will check on her family and try and help out?
and next time tell him to send the money direct from is credit card as hes got no cash?
just a few ideas to consider?