Often I will see The Moon in a relationship reading as a strong emotional/psychic link or bond between the two parties. Unfortunately when the moon is reversed it usually means that there could be emotional problems because they are so strongly linked. (Both of them feeling depressed, angry, stressed, etc. when "one"of them experiences these emotions).
Also see the Moon reversed if a person thinks/feels the other party is overly emotional or has some kind of emotional issues.
When someone shows you who they are...believe them.