The dreaded lads holiday

Hello everyone, so I am a verified overthinker and my boyfriend is going on a lads holiday in June (soooo long yet I know) I was in a very toxic and messy relationship before I got with my current boyfriend and yes you guessed it, he went on a lads holiday and cheated! However my current boyfriend is nothing like him, I know he loves me and I trust him with my life, but the worry of the past is still there because of how much it broke me last time. He’s going with his 2 best mates who are both single and girl  orientated which is what is stressing me out the most really. I am close with his friends and I hope to god that I am worrying all for nothing. What’s in the back of my mind is if they both get with girls, what’s my boyfriend going to be doing? He can’t just be stood there like a lemon :( I don’t know I’m sorry I just needed to get it off my chest because it is a huge weight. I have been with my current boyfriend for a year and a half, we are both 20. I just really want some advice or someone to tell me their opinion please.