It was him who made seth marry nephyths since he was very anxious abt keeping seth close to him by any means. In his previous monologue he talks abt how much he hates sand. Always slipping away so easily from his fingers and boundless untrappable. Seth who was like the sand. his heart Always beyond the horizon and dunes as if he wants to leave far far away" because of this sentiment osiris started wars n shackled seth as god of war to make him duty bound n fight at their Borders. Then he made him marry neph to keep him within the realm of harmony n close beside him XD. Yep he wanted to use mirror on seth cuz he was getting jealous of his own arrangements esp how happily married sethneph were lololol.
Also them being past lovers is a lesser vague possibility than seth X HTE past relationship possibility. Its bleak but lets hold on hope.
But I'm gonna cry myself to sleep if it's true that Osiris and Seth were an actual couple before becoming gods
I mean I still hate him but it'd still be kind of tragic
Wait, when Osiris tried to make Seth fall in love with him he was planning to use that fucking mirror... And that was when Seth was in a heterosexual relationship with Nepthys... So that claim of "i overlooked it when you were with Nepthys but now that you're with a man I'll kill you" is complete BS
Yeah, I've concluded in my own comment while writing it that Osiris is better being RRR, reused, reduced and recycled.