How do I stop worrying over my boyfriend cheating?

Rose473
My boyfriend and I have been together for over a year, and I have known him since I was 12. I love him so much, he's recently moved in with me and my parents and it's been great. We have never argued, however we have had a situation where his friends girlfriend at the time became too friendly with him, and when I spoken to him about it, he went behind my back basically to talk to her. I. e., snapping her every day until it hits a streak as if I wouldn't notice. She was really mean to me as well. However, this hasn't gotten anything to do with the story.
I have severe anxiety, in which I take tablets for it. But the overthinking doesn't stop. Recently, there has been a new girl who has joined his work. Overall, he doesn't like her. She told him she went to a pub her ex was at. She shouted at him, she slept with another coworker, and sent a video to the work group chat about that coworker getting pulled over by the police. That's what I've heard.
He has got a Christmas night out on Saturday, which he's really excited about. But I'm really worried about what will happen when they are having alchol and I won't be there. I think he meant to be funny, but at another friend and his partner (different friend from the last story) , he suggested that they should girlfriend swap. I know he meant it to have a laugh, but it has always stuck with me. I'm just really worried that something will happen, but I know my boyfriend is loyal. He has continually watched his mother get hurt by men who do that, but I'm just worried about the alchol he will be having, and I won't be there that something will happen. I don't want to confront him about his coworker as I don't want to seem controlling or constantly worrying all the time, but I do worry all the time. I do apologise if this doesn't make sense. I just need to let this out
How do I stop worrying over my boyfriend cheating?
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