I F20 and my bf M22 are not going on vacation together?

Okay so my boyfriend is going on vacation to Greece with his (7)friends, knowing damn well that I wanted to go on vacation with him since we haven't gone for 3 years.

"But I have the opportunity to go with my friends, I've never gone with them" (I also have never gone with my friends)

"But we went last time together!" (3 years ago... we haven't gone anywhere together on vacay since then)

"But it will be cheaper if I go with them!!" (it wasn't cheaper)

We've been dating for almost 5 years.

We only went somewhere together once.

I am not from America, but vacation is pricy here. It would take me 5/6 hours to go to Greece by plane if that means anything.

My friends and family and ppl I know, if they have a bf/gf they always go with them or go with friends and their significant other. Or go one summer with friends and then separately with their significant other. We do not have money for that.