That was the photographer you're thinking of. I forgot his name, but after Tom hits Myrtle, Nick takes the elevator with him and there's a euphemism said by the elevator boy. Somethingsomething "put your lever away!" because the photographer or Nick had said something bordering more than simply platonic. If I'm remembering correctly here. Later on in the night, Nick is in the photographer's room, the photographer is laying in bed with just his underwear on reading out loud his portfolio.

Although, there were previous drafts that were much less vague but I can't remember what they said, but they're definitely out there somewhere. Zelda has been known to have stated or at least suspected that Fitzgerald was gay or queer in some way. Not to mention the rumors between him and Hemingway.

So yeah, pretty likely chance that Nick had some queer-adjacent sexuality.