Boyfriend lied about camping trip

My long term boyfriend of 5 years, who I have lived with for 3 is going on a week long camping trip.

Months ago I was told this was a guy thing him and his buddies from back home (he’s from a different state) were doing. Again. Bc they did this last year too and everything was fine on both our ends.

Well I find out a month or so back his childhood friend was invited by another childhood friend. The problem here is that the invited friend is female.

She’s married. She’s just a friend, but that’s not the part that’s hurting me.

The part that hurts is I was never invited. I had to find out about her being invited which obviously means it’s not just a guy trip. Then today when I confronted my boyfriend he got defensive; told me I was dumb for feeling this way and because of other comments I believe it’s going to be more than 1 girl at least coming thru on their camping trip.

Keep in mind he has never done anything close to cheating on me and I am a very jealous person but also keep in mind I was never invited and was led to believe no girls would be there.

I need an unbiased opinion on whether or not I should be as hurt as I am.