HELP PLEASE!

so my boyfriend is going to Thailand for 17 days with his friends. This will be the first time he’s left for that long. I trust him or at least I think I do. I’ve never questioned myself about trusting him until now lol. I keep thinking about how far away, how long, and women!!! I know there are beautiful women all over the world and I am not insecure about my looks at all. It’s more of the fact if my boyfriend can handle being around women with his friends which I think are all single except one 😩. I’m sure they will be going out to bars and clubs and I am not the type of gf that doesn’t allow her man to enjoy himself. I actually want him to enjoy his self but not fuck anyone else 😭😭😭. I’ve expressed to him I feel this way and he says nothing like that is going to happen but damn sis, I’m having the hardest time. It’s really bothering me and it’s all I’ve been thinking about. I even asked him if he wanted to take a break because I’m tripping so hard over this. He laughed in my face and thought I was joking but I wasn’t. He even asked me to go with him but I can’t because I have work and classes. Im just so scared and confused. Has any of you been through something similar? What should I do to not overthink about what he’s doing while he’s gone. The real reason I feel so down about it is because I once dated this guy in the Air Force and he went to LV for only 2 weeks and got in a whole relationship with the girl while still with me. Telling me he’s “working”

But really was going on dates with the girl. Smh!!! Ugh. Just a backstory of why I think I’m feeling kind of not trusting towards my boyfriend. Also my

Boyfriend has never done anything to make me question his loyalty. SO WHY AM I TRIPPING!?