If he cheated you once, then he "might" cheat you again. Could be to a Filipina or Chinese or Indians or Westerners. :(

To answer your questions-
it's not that hard for men to speak with women(except for those who cannot speak english that much) especially if your husband is a little bit "friendly".

PDA is not that acceptable here- (I rarely see Filipinas who shows PDA - dont know in the clubs as I dont go there).

If there are some changes on your routines (as hubby and wife) then its time for you to be vigilant of your hubby's actions.

Cheers!