Nope it was never stated here it could be another of his insane gaslighting ramblings or he's implying to their past lives before ascension.. there's a vague theory suggesting closeness between brothers in the past lives but its not clear if it was meant for osi -seth or horuseth since horus was the youngest brother in their past lives as well
I think chapter 198 of Ennead gives us a little more insight. Throughout the series we have learned demi-gods that finally become full gods (like Horus is about to do) lose their memories from their past when they were a demi-god and they are not allowed to rediscover those memories. Chapter 198 talks about when Seth became a complete god he lost his prior memories and Osiris so desperately did everything in his power to recover Seth's past memories (he even started a war with the Sun god over it). You see at the end of the chapter Seth asks Maat if in his past as a demi-god if he and Osiris were lovers and Maat stays silent. Not sure if they were lovers, but Osiris has gone to such extreme lengths to regain Seth's old memories, so there must've been some kind of relationship between them.
Sorry to join your convo guys but I couldn't help myself haha. Omg im sooo excited for s3 as wellll. Ive been saaaat since last year September counting down days for the release. Regarding horus, some pll say he might not forget seth because of wadjet's powers and might even end up recovering his past life memories as HTE but acc to murals hidden in ennead there's mention of ra horakhty which is like a fusion version of horus n ra and this scares me cuz what if ra ends up absorbing horus. There must be some ulterior motives for calling horus over to sun temple or maybe im being too paranoid but lowk i feel like ra might wish to get her wadjet back and attempt to absorb horus

At the end, Osiris says that Seth forgot him. I’m so confused. Is it stated somewhere that they were ever consenting lovers? I thought it was pretty much one sided. I did a scroll through and didn’t see anything.