Bf on Lads Holiday

My bf is going to magaluf for a week, I trust my boyfriend so much like I know he would never do anything and his friends have said it to me twice like he never would, he’s very loyal, but I still seem to overthink so much and it upsets me a lot I just cant find anything to help me deal with it he said he would reassure me to the point that he will try to annoy me with reassurance, but I still overthink and wonder and get insecure thinking the other girls thag will be there in bikinis especially if they go on a boat party. I know I’m clearly insecure in myself but I’m not sure what to do. I want this week to fly and to just have him back asap but all I do is worry, any ideas ? Or help?

His friends do try convince him I know they do I’ve herd comments made before and I’ve had a bad past relationship where my ex cheated and my parents divorced so I feel I have very hard way of coping as I worry over relationships with two people not working, I don’t want to take it out on him because he’s so good to me but I don’t know how to help myself so I don’t project negativity onto him