I honestly can't think of any Shakespeare play that is not better if staged as full of bisexuals. It's harder to miss in the ones with all the crossdressing, but really, I think he just lived in a milieu where that was taken for granted...

(I do wonder about all the faceblindness, so many old stories depend on people not recognizing each others' faces in situations where that seems unlikely. And I'm not great with faces myself, but even so! On one hand it was probably just a literary trope you suspended belief for, but on the other hand, it starts to become less common around the time that glasses start to become more common...)

If you don't like the notion of actual enemies being Secretly in Lurve this recs series is probably going to annoy you after awhile. :P But I would class "were together, had a bad breakup and can't be in a room together, not actually over it" as a totally valid subset of Enemies to Lovers, just the Lovers to Enemies to Lovers subset.