Am I overreacting for wanting to sleep with my husband?

So finally me and my husband were able to go to my husband's summer house for summer vacation.

His kid (7 year old) was already there with his grandparents (my in laws) a week early.

I have been to this house a couple of times with my husband. And he has been many times with his kid. But its the first time we will all be here together.

As the night came the sleeping arrangements fight start to happen. The kid demanded to sleep with his dad and all of us, tried to explain its not right to split couples when sleeping. The kid was admittedly tired and started acting bratty demanding to sleep with his dad. My husband all of the sudden agreed that only for this night he will sleep with him and tomorrow he will sleep with me.

I dont know why but I felt very hurt. Although I even started considering letting the kid sleep with his dad, the abrupt and solo decision my husband took left me feeling left out. I told him it was not right of him to do this and now I am in the guestroom alone and hurt.

On one hand I understand his kid misses his dad a lot and wants to sleep with him but on the other hand I can't help but feel left out. Not only from his bed but generally. Am I overreacting?