How can 関係 be used when there is only one subject?


In my textbook there is a clause that I don't really understand:

なぜ占い好きと関係があるというと、、、

So my understanding takes me this far:

  * It's a question asking why 占い好き something
  * It's asking why something about relationship(s) - or why relationships to 占い好き exist?

My problem here is: 関係 means relationship right, so I would expect to see at
least **two** things references: ie why is there a relationship between 占い好き
AND X? ...but here there is no X. To me the question just seems to be: why is
there a relationship between 占い好き ... huh?

Any comments much appreciated!




I think the sentence is about to explain how "IT" is correlated with 占い好き. And
"IT" must be something in the previous sentences or paragraph. It is common to
omit pronoun in some cases. The full sentence may be:

なぜこれが占い好きと関係があるというと、、、

