Seems you are focused on one person now so that "why" is the question. Decide if you want to spend time thinking about this or not. If the giver is an "ex", remember the reason he is an "ex" and move on. It is not as important as you are hoping it is. This is a game, if you think about it. If this was important to the giver, a note would have been left so you would not be left dancing in circles.