Moon hates Mars by sitting in his detriment, it has no inclination to help him. Think of them as Kings.
The Moon is exalted in Venus territory is busy antagonizes Mars, who she does not like. Despite Mars being a King, his influence is severely limited because he is enemy territory so he can only take what the Moon allows.
The Moon, maintains a strong connection with Mars through a sextile which connects them both - so Mars might be saying lets do this and Moon being far more powerful and without little issue since they are connected by a sextile can just say No! Mars being in Moon's homeland must abide to it.
Venus, despite caring deeply for Mars, struggles to influence him directly due to their opposition. So Venus may be sending help and Mars has to send it back - The Moon won't let me take it, Sorry!
Venus's however has intense authority over the Moon so she may attempt to intervene and persuade the Moon to stop antagonizing Mars for example if you want to stay here be nicer to Mars! Moon who absolutely adores Venus may just say Opps, Sorry Mars!
I assume you are new to astrology - it is reception that answers the planets attitude to each other and aspect that shows whether or not they are even in conversation. It is tricky to understand but once you do it's pretty easy. For example you can have a bank that you can love, hate, or remain indifferent to - but whether or not you can connect to that bank is a different story. If you're at home then its pretty easy to walk over to an ATM and take the money out (Trine) versus if you're out of the country and the bank isn't hosted over there (No Aspect)