I'm sorry,
@ryannnn, but there several varieties that have a similar flower, and I'm only referring to named varieties. Because of there being 1000's of hybrids out there now, unless a flower or leaves are unique, there's just no way to make identification certain. Unfortunately, to complicate matters even more, plumeria flowers change season to season. Because you've had your tree for a decade, I will say that your tree might be Rose Red. If I were to label her, the label would be: "NOID, Similar to Rose Red".
Here's flowers of my Rose Red. The photos were taken over several years. Notice how the flowers differ in that last photo. Those flowers are all on the same plant but the flowers have differing ages, just opening to 3-4 days old flowers.