I've been dating my girlfriend, Yosiko, for a year before we got engaged, and we're now busy but happy preparing for our wedding. One day, Yosiko told me she was going to attend a reunion of her university club, where her ex-boyfriend would also be present. Worried, I asked her to promise me not to drink too much and to take the last train home. She left after making that promise. During the drinking party, a video was sent to me showing her ex-boyfriend casually putting his arm around her shoulder... Worried, I called her, but she said she wasn't feeling well, gasped for breath, and then hung up. I haven't been able to contact her since...