Trinaa, about 180s... the way I understand them defined in DR are for creating noticeable differences in order to capture the attention of the WAS to pop you into their mind saying, "What's the LBS up to?" so that they ponder on you. I think the other purpose it serves is to help boost the PMA of the LBS. Well, fine and good, so folks wear new do's and start mountain biking.
But I think those all touch upon the superficial outer layers and that more important are the 180s in the patterns and behaviors that served to not mix well in a relationship. Was the LBS not meeting emotional needs, for example? Very common and very probable. Those are the changes that, over time, show the WAS that the things that made them unhappy are no longer present. The impact of that is much more far reaching than a new do. For one thing, it can clear the way for the WAS to reconsider the relationship. For another, it can create the opportunity for the WAS to realize that, if the LBS has changed with the problems no longer existing, any unhappiness the WAS has with their current circumstances aren't because of the problems they were walking away from, but rather, are their own demons.