boyfriend wants to go on a lads holiday

So ive been with my boyfriend 6 months and ive moved into his (soon i know) but it felt right. Now hes wanting to go on a lads holiday in june baring in mind me and him are going on one in september but hes struggling for money as it is ive told him im not happy with it but he goes in a mood and we start arguing please can i have peoples opinions on it