would you be annoyed??

So my boyfriend goes to a different university than I do but both our semesters end the same time. The other day he was telling me that him, his best friend, and his best friends gf were all going to go on a little vacation together when their school got out for summer.  He didn't even ask me To go with them even if I would've said no. I'm kind of annoyed by it but not annoyed enough to start an argument. I just feel like since we've been together for a while it would have been nice if he was like "even though I know you won't want to go, would you wanna to come with?" Am I just being dumb or would any other girls be slightly annoyed by your bf not even asking to go with? 
**not looking for rude comments. My bf and I have a very trusting relationship I just want other girls opinion on how they would react. **