Moon Opposition Neptune love Synastry ~ Difficulty Expressing
The Moon is the most important 'planet' in relationships. The Moon represents deep security needs, and it is difficult to be with with someone who does not offer us what our Moon needs. Positive Moon compatibility will show two people who feel "at home" with one another, and instinctively care for one another. It's like being family. That's why it's the most important planet in synastry. If you want to spend the rest of your life sleeping in the same bed as someone else, you obviously need to feel like family to one another.
Moon Opposition Neptune
Your partner wants you to fit their romantic ideal which makes it difficult for you to express your true feelings. When the Moon person is in opposition to the Neptune person, they doesn't fit your idealization of your romantic expectations. Idealism, fantasy, and imagination permeate the atmosphere between you and your desire leads you to believe what you want to believe. Your souls are spiritually linked, you have two approaches to romance and relationship and this is one of the reasons you are together.