Jupiter represents expansion, luck, optimism, religion, and higher education. Strong aspects between your Jupiter and your partner's planets and/or points favor generosity, good will, and fun in your relationship!
Jupiter Square Neptune
This indicates a tendency for you to get each other involved in impractical, emotionally oriented mystical religious practices, which can take the form of cults or guru worship. You will probably encourage each others self-indulgent tendencies. There can be mutual avoidance of discipline and necessary practical responsibilities. Both can neglect the practical handling of domestic responsibilities. You may even embark on meaningless religious pilgrimages or become vagabond travelers. The Jupiter person may regard the Neptune person as vacant or immersed in a private dream world. The Neptune person is likely to regard the Jupiter person as too attached to traditional beliefs.