I've had allot of relationships in the past two years. I've helped a few relationships though. I've also helped quite a few men become more confident with women. From all these experiences my consensus is that unless people are shocked out of their original view of the world nothing will change. You can give them a quick fix but the same shit just keeps happening again and again.
Changing things up is a great way to learn because when you are in a relationship more often than not the less motivated of the two act as an anchor to progress. At least for a little while one of the two has to pull twice the weight in order to get though an issue. This is very hard, if not impossible, for most people. When we are exposed to new people we get new perspectives and that allows us to learn and grow.
In the end it's all about being happy. Having the confidence that you'll find happiness and holding yourself responsible for that journey. Sometimes that involves the excruciatingly difficult task of leaving a comfortable but passionless relationship.
Of course this comes from MY PERSPECTIVE. I am very confident in my ability to fall in love with women. I don't see relationships as something that the world gifts me with but rather a state I can easily choose for myself. If I don't like my current relationship I can go start a new one next week. That's me. I know that most of the population simply doesn't have that kind of confidence. So while it's very tempting for me to say "move on" I know that most of the time it's not the best advice. This is exactly why I don't post much in those types of threads even though I have allot of opinions on the subject.
Now you've got a bit of my "move on" perspective.
cheers!