Is she married already? Can you visit other countries (conceivably) and get married there? (I don’t know whether that has legal ramifications in the Philippines.)
As previous poster noted, it is critical for the conjugal status to be able to prove significant (read: insurmountable) barriers to marriage/common law.
(And I add another q I don’t know about, whether you moving to PH in order to establish common law would cause issues for consideration of your conjugal case)