I've heard some interpretations, that if Venus DOESN'T belong to the 1st or 7th in a romantic horary, that is may signify a 3rd party (girlfriend or wife).  My question is, is this always the case? 

Because I've asked a horary and Capricorn rose.  I am Saturn and he is the Moon, but the question is 'Will he return my contact?"  Because I sent him a few emails.  Venus is in the 7th in Cancer, but it is a little strange to think it is a third party because Venus is my dispositor.  What do you think? 

There are not many things in astrology which are "always the case".  Context, for example is "always" important. 

Venus is your co-significator (I am assuming you are a woman.) 

My first horary teacher would assign a planet inside the 7th cusp as a co-significator of the quesited, and gave me a chart example exactly like yours with Venus for a querent woman in the 7th.  And that is why I changed teachers and never looked back. 

Venus here shows that your "woman side" is very interested in him. 

Since you are asking about an event, to answer your question we usually need an aspect with favorable receptions between one of your significators and one of his.  It is possible to have the event without an aspect too, such as a planet entering a house; but we need to look at the chart to tell. 

Now, in your chart, if the Moon or the Sun are conjunct another planet then there may be a third person. 

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