The Roman name for the Greek Eros was Cupid.
There is no chronology in the ancient myths.
To explain why things are the way they are
There are gods and myths which the ancient Egyptians borrowed from other cultures and cultures which took myth and gods and goddesses from Egyptians. Many cultures in that area lived and traded and communicated with each other for thousands upon thousands of years, so "stolen" myths and gods and goddesses on both sides are to be expected.
In roman mythology Cupid is not told to have cheated on his wife Psyche. However, there are no myths of Cupid and Psyche after their marriage.
Of course! Greek mythology is some of the most educational myths from ancient cultures. The fables and myths teach good life lessons and morals.
All cultures make up myths.
No, Roman, his Greek name is Eros.
Almost all cultures have myths.
no
They complement Cupid then ask him for what they want.
Yes. Many cultures have myths about shapeshifters.
There are as many different beliefs and myths about the earths movement and the stars as there are cultures. Each ancient culture has it's own stories and belief systems. You can study any culture from the Greeks to the North Amrican Indians and find their stories, the interesting thing is when you start to find similarities between two totally different cultures.