Ah, R’s sexuality.
Personally, I see him as being non-monosexual in that he’s attracted to men and women (but pretty exclusively in love with Enjolras because he’s got it bad, honestly), only he feels like he has to play up his attraction to women in a theatrical manner in order to make himself seem less vulnerable.
He’s a depressed, conventionally unattractive alcoholic who’s in love with a man. That is not someone you want to be in 19th century Western Europe.
Pretty much exactly what I think, too