Question

can someone tell me the reason why Aphrodite and Hera were feuding? was it because they didn't want Aeneas to make to Italy?

Answer 1

Aphrodite and Hera often feud because Aphrodite is the symbol of love and Hera is the symbol of war. In mythology they often used to portray conflict.

Answer 2

so they fought in Aeneid because they always do?

Answer 3

... and because Vergil wrote this to emphasize a connection between the classical Greek culture and the new Roman culture.

http://en.wikipedia.org/wiki/Aeneid