Stained
Sometimes people, that dump me, years later change their mind and even ask me out. My feelings are gone by then, and no matter how I wish for those feelings to come back to me, that never happens. And there is this thought on my mind: "Come on! I can finally take that all, I ever dreamed of once! Here it is! And nothing?! I simply don't want it anymore??"

The explaination is, if something is dumped, it gets stained. If somebody dumps another person, then changes her mind, must realize then, taking back something out of the trashcan usually means a lot of cleaning afterwards.