How do you walk away from a relationship that seems perfect?

If you are the type of woman that likes to fix people then maybe that the root of things, maybe not. If you stayed in a health relationship which it sounds like to me just for his sake then you are going to feel this way because the job is done. Some women just don't know how to to stay with a nice guy their needs are messed up and seem to go for the bad guys. Take a long hard look at why you want to run and be honest with yourself and him. Stop and smell the roses for once. Relax and enjoy, go with the flow. Then if you really think this guy is not for you then leave.