Having fun without me

I can't believe he's having fun without me 😭 he left Friday night and won't be home until Sunday. I haven't talked to him either because I've been working. My dad and step-mom wanted to keep him for a weekend, so I said yes. But dang... He's only 9 months old, he should still want to be with me all the time and get upset when he's not 😭 I'm not handling this well at all.