Okay, so I think I am forming a plan here. When I see Sweet Girl this afternoon, I will fight my baser instinct to tell her to tell him to go to hell, that if he doesn't appreciate her there are a million more who will (frighteningly true), or that if she ignores him he'll come crawling back (yeah, my mind went there). Instead, I will hold her and let her know I get it - not him or his actions, but the hurt. I do get it. And I will remind her that no matter what happens with Sam, she will be okay. That, I know.
Try for store credit
Sometimes a store credit or exchange will be allowed, even if a return will not. Take advantage of store credit to get something you actually want! Try to return as soon as possible, though. If you don't have a receipt , you'll end up getting back what the lowest price of the item was, and not actually what was spent!