Worried about boyfriend travelling alone?

My boyfriend is going on a tour of Europe for a couple of weeks...by himself. He's doing an organized tour group thing, going to a bunch of different countries. I'm happy that he gets to travel, but I'm kind of worried about what might happen while he's there. He's never cheated on me, never lied, never given me any reason to think he would...but it's just my own paranoia. How do I stop freaking out about this?
Worried about boyfriend travelling alone?
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