My boyfriend didn’t invite me to his birthday dinner?

Lunatt08
We've known each other for two years through work. After that, we spent a year getting to know each other as friends.
We both developed feelings for each other and have been dating for four months. I've had the opportunity to meet his family and close friends.
His birthday is approaching, and he has planned a dinner and drinks with one of his friendship group. He bought it up to me, but he hasn't invited me.
I was sad/upset that I wasn't invited and told him so. He claims that this group is very private and that they do not invite their significant others to outings. We have a birthday getaway at the end of the month, which I planned.

Is it reasonable for me to be disappointed/upset that I was not invited?
Is this something to be concerned about, or is it unimportant?
I'll talk to him about it after I've collected my thoughts, feelings, and assessment of the situation.
(F) 22 , (M) 27
My boyfriend didn’t invite me to his birthday dinner?
7 Opinion