How would you feel if your partner wanted to take a trip with a member of the opposite sex?

I am in a long-distance relationship. My partner is planning a trip to another state with his friend Janet. I do not know Janet at all. We’ve never met. This trip would last about a week. Would you be okay with the person you love taking a vacation with a member of the opposite sex? Am I being paranoid? I trust my partner, but I know nothing about Janet. Why would he want to take a trip with Janet?

Please share your thoughts.