2nd baby anxiety

I keep having these awful moments of anxiety about how my first born (8years old) is going to feel when the baby is born. He's been an only child on my side and his dad's side, and I'm not even going to lie, pretty spoiled. Not just with things, but by our attention. We plan whole vacations for him. We do mommy son date nights. I love him so much and I'm so scared he's going to resent me or the baby. He told me he's excited for a baby brother, but also worried he isn't going to get attention. I promised him that just because there's a baby doesn't mean we'll love him less.

Anyone want to give me any pointers, or just some reassurance?