I've had girls disappear before, but I had built up a close friendship with this one. One day she told me she wanted to move it to a romantic relationship. Two weeks later, ghosted. I feel more like I lost my buddy really, and it's worse. If she was just some girl I dated for awhile, I probably wouldn't care. I look at it this way, she probably has some issues she has kept to her self, and she is going to need a long time to work it out. Probably the same as your guy. I'll move on, and hope the best for her.