Responses
Did you miss that he's been living a majority of his life just under the belief that he can never bring his partner happiness or something? Take it as internalized misogyny coupled with internalized homophobia in the real world. Like did his twin bro go about the wrong way to "set him free", yes, but considering how he kept lying to himself about his own feelings, he needed something in order to push himself out of his own toxic mentality.
This is fiction. It can be as melodramatic as it wants cause otherwise, it's just boring like real life.
Someone said we have to look up with the society condition,..
Dude, they already disguise their married like over years without judgement? And they are twin identical, so no worries hiding the identity until now? Of couse no one know you are couple alpha x alpha if u comfortable to disguised like that way to be together...just easily build ur happy family and never mention the omega one. Thats it.
And to get offspring, just do surrogate? the omega bro could be the surrogate mother, thats more healthy way.. Does the surrogate thing not commen in this manga universe? Hell naahhh...