Bf travelling with friends

So I'm in a LDR and my boyfriend's birthday is coming soon. He told me today that he wants to go to Spain with his friends (all of them single) for 6 days to the beach and to visit 2 girls, friends of him (which I know but don't like and he knows it). I am honestly not comfortable with any of it at all. They're going to be drunk 24/7 and being in a LDR is hard enough to have 6 days when we aren't gonna speak much and more knowing that he is going to be partying all the time surrounded by girls and guys that want girls. I know i might sound selfish, but he is a jealous guy too. I do want to say something but i don't really know how to say all of this. Advice and thoughts please? p.s. I know im not his mom and cant tell him what to do but i just dont feel it right. thanks in advance