The Sun symbolizes our sense of purpose and our identity.
The Moon connects us to our body, our family and our home. It is our inner feeling life.
When the fundamental elements of the chart, the Sun and the Moon, are at odds by being squared, often one planet's meaning is developed and the other is not. This can be a problema for one's inner well-being and also it can affect how we relate to others as well.
With Sun-Moon squares, usually, the Sun develops and the Moon is ignored or repressed. Then our feelings, our connection to our bodies and to our families, are ignored, and it can cause a great deal of suffering. So what is really important is to pay particular attention to your feelings. See how you feel, especially when you are sad, and be always give yourself the private time to express your sadness or tears. That will help a lot with a Sun-Moon square.