@Bisexualgirl have you heard of the lore? There's gonna be so much angst coming up, most likely at the end of season 2. Seth will find out the truth of Nephthys and be so angry at Horus, feeling betrayed and hurt, that he will gouge horus' eyes out. So Horus will go back to Egypt and get healed. The marriage will be resumed... But don't worry. According the the hieroglyphs that mojito put, there won't be a marriage happening. It'll be interrupted. Hahaha!
I fear Horus will be forced to ascend and he will thus forget about Seth. That's why he will go along with the marriage, because he won't remember Seth. At least, not fully... I'm sure deep in his heart he will recognize by his instincts that he had a deep connection with Seth.