My husband has a long-time female best friend - they’ve never dated but had a brief “thing” years ago before we met. She’s getting married abroad and due to work and budget, I can’t attend. He still wants to go alone, says it’s important to him and it’s “just a friend.” I trust him but I’m not entirely comfortable with the idea of him flying off solo to a wedding of someone he once had a thing with. AIBU for saying I don’t want him to go?