Yeah you should definately listen to her. Throughout my current break up process I don't think I made a serious conscious effort and three months later it still is painful. Getting into a routine is helpful and working out like a mother****er is important (although I guess seeing her there doesn't help). Accepting that it's over and not banking on the fact that she still cares and will "come around" is a big deal too. I know it's stating the obvious but I honestly don't think I have really accepted it yet and that has been a big part of me hanging on to it.
It's ridiculous and borderline unfair how easy it is for a girl to replace a guy and they can have their pick of guys lining up. However, there isn't any true fulfillment and satisfaction there and it will take a string of guys dicking her over for her to hopefully figure out that maybe there is something that she is doing or something about her actions and decisions that factor into this.
Being with somebody at all times is not really healthy either. Having a need to be codependant on somebody is incredibly unhealthy. I think the secret to having true happiness is in a relationship is that you don't need them to be happy but you want them because they make you more happy. If you need somebody to be happy, then there is something wrong there.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.