Fiancé taking baby out of state

So my fiancé wants to take our 4 month old breastfed son to Michigan for a weekend trip (his cousin is getting married and we’re in Rhode Island)

I don’t feel comfortable with it we were both gonna go but now unfortunately we can’t afford a pet sitter due to unforeseen bills and he said he’ll just give him formula while they’re gone and I can enjoy a break from being a mommy.

He’s not a great dad tbh like he’s good at playing with the baby and feeding him but I do 99.9% of the stuff for our baby. He freaks out anytime the baby cries for more then 2 minutes and will just dump him on me or put him in his crib and shut the door and go play video games.

This would be his whole family there and 1st chance to meet our son and I obviously want them to meet him but I don’t want to entrust my baby with people I don’t know. I’ve never met them in our 2 years of being together only video calls!

I just feel super uneasy about sending my baby on a plane with his dad for a weekend trip (leave 5pm Friday return Sunday at 11pm) whilst staying here alone sobbing the entire weekend and having to pump for the freezer instead of feeding my baby 😭

Idk I just need somebody to tell me if I’m being insane or not

Would you let your partner/husband take your baby?