Be Wary of Seeking Closure
I think closure is over-rated. Despite how much your bruised ego thirsts for it, trying to figure out what went wrong and who did what will not help. Trust me, you don’t really want to know why someone rejected you. It’s like running back into a burning house to find out how the fire started. It's far too difficult to find the source, and you will inevitably get burned in the process. Just walk away.