As with so many things, this situation can usually be prevented. Some women have more expectations than any man could live up to. That is its own problem. I'm talking here about fairly typical women involved with fairly typical men, not major pathology. Most of the time, if a wife or girlfriend brings something up, she does so because it really is important. Guys need to take it seriously, even if they don't understand, and try and do the things she says make her feel loved and appreciated. What she needs may be very different from what he thinks she wants or needs, but she's the one who knows what those things are. A little genuine effort can go a long way towards preventing the "walk away woman syndrome."
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!