Do I have the right to be upset?

So I spent this past weekend with my boyfriend, I’m 22, hes 24.

We made plans that after work, he’d come over, around 6:30, and we would spend Memorial Day with my family.

This morning he texted me that his best friend and neighbor is through a cookout at noon and he is now going and no longer coming over.

He sees this guy all the time and only sees me once or twice a week.

We have been together 7 months.

I have the right to be upset, right?