Once you become a US citizen, you can no longer use your old Philippine passport.
At this point, the decision as to whether or not reclaim your Philippine citizenship will be totally up to you.
Should you decide to keep your Filipino roots and become a dual citizen, you can read this guide to learn how to apply for retention/reacquisition of Philippine citizenship.
It is only after you reclaim the Philippine citizenship that you can apply for a new Philippine passport.
Go back to the main page: How to Get Philippine Passport: An Ultimate Guide