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 Saturn
You feel restricted by your romantic partners serious outlook and approach to life and your relationship. When the Moon person is opposition to the Saturn person, they feels that your attitudes are doing the limiting or inhibiting. Either way you are both right, but find yourself connected to your partnership by your need for security. Your different points of view are the reasons you were attracted to each other in the Moon place. You each need a bit of what the other one has and takes as the only natural approach to things. Share your viewpoints. Without your partner it's much like sitting all alone on one end of a teeter-totter.