He dated him because he though he was an alpha but didn’t hate the pheromones but found he was an omega and then suddenly throws up - so the scent isn’t the problem but the idea of being with an omega is - what the hell happened!!??!??!
He didn’t realize he was an omega, he solely believed he was an alpha which is why his trauma didn’t kick in. Once his brain realize what’s actually going on, it started to kick in the adrenaline. Tbh it’s pretty common for things to happen like that.
He dated him because he though he was an alpha but didn’t hate the pheromones but found he was an omega and then suddenly throws up - so the scent isn’t the problem but the idea of being with an omega is - what the hell happened!!??!??!