Very interesting. I feel as if my ex traded down. I am a nurse, she is a lawyer. By profession, one might say he traded up (although she doesn't make much money?) She is also not physically attractive at all, doesn't cook, doesn't clean, is a hoarder, enjoys very little activites, is scared of balloons and water, and I hear is very lazy. But what does she have that I don't? The ability to put up with his nastiness and having everything his way. I stopped putting up with that.

So, it can be seen many ways, that affairing up or down thing. Basically, someone else is giving them something they feel you can't, whatever it may be.