I think he'd get cocky and see the baby less as an a nuisance but more of a leverage. To show off that he is the one and only. To ward off the others. I'm unsure how it works in this story but I think parents outta wedlock (or in the case, mates) are frowned upon. So maybe that?
the gray haired is going to get mad at the pregnancy even though it’s his fault isn’t he