"My ex. She was—well, let's just say the divorce was not amicable and I ended up joining Star Fleet after listening to a counselor. But part of what I had to do to get myself through military training was telling myself I wouldn't be friendly, I wouldn't get chummy, and I wouldn't even attempt to date. Bury myself in my work and training and focus there."
He leaned forward and shrugged. "Obviously that's not something I need to do anymore, and I am over the divorce, really. But I didn't see much reason to break my habits."