The text in Note 1 may contain no links to any other notes, i.e. no outward/front links.
However, Note 1 may have Note 2 linking to it, i.e. Note 1 may have a backlink from Note 2.
The Graph View shows the links between notes as lines. It does not show whether the line represents a front link or a backlink.
It would useful if the lines could be arrows instead, thus showing the exact link relationship between notes. And if Note 1 has a front link to Note 2, and Note 2 has a front link to Note 1, then the Graph View should show that as a double headed arrow.
Remember that your brain runs in both directions. It goes from one subject to another then come back to the previous one. So IMHO direction of links might not be valuable. In fact, you’ll finally be used to read your graph view always in the same direction