Separation anxiety from partner

This is going to sound so stupid.

My partner and I have been together for almost 8 years. We have two gorgeous babies and are overall quite happy.

Since the beginning of our relationship weve only really been apart from each other for a few days/nights in a row.

My partner is leaving in a few hours to go overseas with his mates for a week and a half to celebrate one of them getting married. I am so so scared. I don’t know why. I trust him wholly. But in the back of my mind I know you can trust someone to the ends of the earth and they can still fuck you over.

I know his mates I’m friends with their partners etc. the guy who’s getting married is 100% just going over there to fuck anything with legs. He’s already cheated on his bride to be with his ex. I’m not sure how the others will go having partners but I don’t have 100% confidence in them either.

I don’t know what I’m trying to say. I’m scared to end up a single mother. I hate feeling like this and just know I’m going to be stressing about it the whole time he’s away. On the outside to all our friends and family I’m acting like I’m fine with it but on the inside I’m a crumpled mess.

On the inside I’m just preparing to be single when he comes home 😭😭😭😭I know everything will be fine but I just can’t stop my mind from going to these places.

I’m just scared of my trust and heart being broken, my relationship being broken and my kids being hurt

Help