You're just jealous, let me say this straight.
The boy only comes for a visit on the weekend and holiday (school break).
You have his father for the rest of the time.

You husband is a decent guy. He tries to do his best as a father.
It's not unusual for him to spoil or pay attention to his kid, as most
father thinks he wants to give "extra time and care" because he couldn't be
there with the boy every day any more. He just wants to show that he cares
or makes the kid feel secure even parents don't stay together any more.

Imagine if this boy was  your own kid and he had to visit step-mother like you,
would you feel happy for your kid? Would you want to kill your ex-husband
if he didn't treat the kid right ater you're divorce?

Again, your husband is a decent guy. Keep yourself busy reading, cooking, cleaning,
going out visiting your family, friends or shopping once in a while. Get yourself some
free time. It's better than you keep fighting with him. Stop making ugly scene.

You know before you're married a guy that he he has kid, right?