My girlfriend purchased this plant for me but it did not come with a label and we're unsure what kind of plant this is. I would like to find out if anybody could help I would appreciate it greatly thank you.

It is a tropicalplant known as Plumeria or Frangipani.
Plumeria need to be warm, perhaps 65-85 degrees with 3/4 hours of sun each day. But they can't take full sun and heat. They may require some shade from 10am to 2pm.
They never want to dry out.

When the weather cools down, then tend to lose leaves.
Why of why did I call it a plumeria when I knew it was a desert rose?!?! Stupid geezer.
I apologize. My mistake.

It is Adenium obesum. Grow like cactus/ succulent in full sun and very fast draining soil. As winter dormancy approaches cut back on water until new growth begins. We have an Adenium (desert rose) forum here, and you will find many in our Data Base.

Adenium. Plumeria doesnt have a caudex. Flower will tell species. Most are hybrids