
Actually uke did ask him what he would do if someone appeared and told him they had his child and his response was that he would get rid of it because it probably was for money.
so uke when no contact and disappeared but In just a few days seme thought about the conversation and he believes that uke got someone pregnant and that's why he was angry at his response.
After a week seme is already looking for him everywhere getting crazy at the idea that uke has someone else an probably has someone pregnant and thinking "what if he gets married with the girl" he discovers his feelings for uke then he discovers uke is omega an all the pieces fall together in his head and he runs to find uke in the island he's hiding
To anyone that read the raws, when does ml find out that mc is actually an omega?