It's actually for their country cause the uke said that he's his enemy "A prince who lost the pride of his name such a man cannot be this father's child(the baby is already born) I am your enemy.I led the army and burned your country.Please keep your honour as a prince and leader of your country's revolutionary army" i think the uke said this because the seme is willing to give up everything even his country just to be with them,i guess he wants to live a now normal and happy life that he's willing to forget that this man(uke) is the one who burned their country but the uke rejected him,the ml was hurt but still said sorry even though he did nothing wrong and some spoilers said that they're going to separate, meaning he will not see his baby growT_T
I am not trying to make the uke look bad in here,it's just my own understanding base on what i saw with some spoiler so we cant judge the uke,we need to see his own POVs

I saw some spoilers Mshdkahfka the seme got rejected but idk why or what might happened next ╥╥