I think it's from the point of view of a man who has gone through a terrible divorce or breakup, and now he is feeling the pain of not being able to be with his son. The mistakes he has made have compromised his ability to have a relationship with the boy as he grows, and he can't believe he could have been so stupid. He only wants his child to be with him, but he knows that the mother is suffering from the separation too, and that she needs her baby with her.
I think it's from the point of view of a man who has gone through a terrible divorce or breakup, and now he is feeling the pain of not being able to be with his son. The mistakes he has made have compromised his ability to have a relationship with the boy as he grows, and he can't believe he could have been so stupid. He only wants his child to be with him, but he knows that the mother is suffering from the separation too, and that she needs her baby with her.