Leaving and returning

Sorry! I have tried to find answers but am now more confused than ever!

UK national, been here now on tourist visa for 14 months and taking my Filipino partner to Vietam and Malaysia for 6 week holiday next month. My Visa will still be valid but my ACR-1 card will have expired by 2 months when I leave.

Intending to restart the tourist visa process again when we return (2 months free and then renew every 2 months etc etc).

Two questions: Do I need to renew my ACR-1 before leaving and if so will it be still be valid when I return or need to buy again?

Also, although no intention of leaving Philippines again do I still need to show a return ticket when I arrive? I believe there is a website to buy a cheap one that is valid?

Thanks in advance for any help.