Well, I did not end up crying...or at least yet. By entering into the speedy engagement, OM is probably trying to draw a sharp contrast with me. She always felt that it took me too long to propose. She probably accepted because she got swept away by her emotions. That would not be out of character for her.
But I don't have any idea how long this has been going on. At the outset, I asked, but she refused to tell me. That was the last question I asked about it because it doesn't really matter to me. If we were reuniting, it might be useful to know more information. If we're not, I cannot see what good the information can do me. We're also at that point where I am the villain in her life story and I ruined everything. So, it seems wisest not to ask questions or discuss anything.