I tend to think the sonnet is a snapshot into an argument between a man and a woman.
The ups and downs of the relationship have taken their toll on the couple yet the man still has great affection for the woman.
He appears to love her so much that he (still) wants to have kids with her.
The sonnet is about procreation. The child is a product of a man and woman's love. Procreation is also a way to ensure that the man and woman would survive in the future. The child is an image or extension of the couple.Make thee another self, for love of me, That beauty still may live in thine or thee.
- Sonnet 10, lines 12-14
The narrator of the poem has an opinion of another that is very selfish. He sees this person as a loveless person who only cares about themselves. The narrator wishes they would change, so he could think differently about this person.