It is perfectly normal to not want to get over it, because you cherish the feeling of love even though it hurts now to a letting go.

There is a certain sweetness and poetic appeal to being sad for love's sake, though I'm not sure if it is a healthy thing to wallow in for extended times.

On the other hand, suppressing your sadness directly is a sure way for those feelings to become stronger and more powerful, feeling suppression is an ironic process. The stronger your efforts to suppress your unhappiness, the more powerless against them you become. (http://en.wikipedia.org/wiki/Ironic_process_theory).

Like rumination, sadness must be acknowledged and then dismissed. A helpful attitude is something like "I am sad now and I have permission to be sad now, but I will not let the current sadness stop me from attempting things that might make me happier. Sadness is just a disembodied thought and so is powerless to forever control my actions."

So I think I understand your gist, but the phrasing is a bit off. I don't think it is helpful to advise people on how to get over it if they don't want that. I also think it counts as dwelling in and ruminating on sadness, which is an unhealthy way of dealing with feelings. And I also think the people who don't want to get over it wouldn't be seeking out this post.

I'm going to edit the post to mention meditation. Mindfulness meditation is a third wave technique with fantastic clinical results in reducing sadness and rumination. The attitude of mindfulness allows you to become aware of your thoughts without dwelling in them or being trapped by them. You assess each thought or feeling, acknowledge it, and move on to the next one.

If you have slight depression, it seems like your brain might be biased to notice the passing of good things more often than the bad, despite the knowledge that all things pass. All negative feelings are just as temporary as positive ones, all negative life events are just as temporary as positive ones. If you appreciate Buddhism, but you might find that you grock the impermanence of sadness and negative things better if you take up mindfulness mediation. After learning meditation techniques, just 5 minutes of maintenance meditation a day did as well as medication for alleviating mild depression, about as long as brushing your teeth takes.