Your two moon signs are completely opposite from each other forming an Opposition (180deg).
This relationship may be extremely good, or it may be extemely worse. When you are getting along, it may be great, otherwise it could be very bad. One of you may feel like you have to please the other, however this may be the sign of an imbalance in the relationship so take extra care to watch out for this in this relationship.
Your Moon signs indicate that you are only a little compatible. Aries is a Moon sign of high spirits and independent fire, whereas Libra is a Moon sign of balance and indecision. The Libra Moon seeks to please everyone. Together the two of you get along well. You may find that you cannot fully get along well in this relationship as the Aries Moon may feel impatient with the tranquil and peaceful ways of the Libran Moon.