If I've got fuck all to do, usually a while. Otherwise, always try to fit some in.
Sadly, I always find gaming a good cure for the blues, really takes you out of your head. Gaming helped take my mind off my last break-up, when the "there's plenty of fish in the sea" argument doesn't help.
Then I go through periods where I am completely tapped out, and play absolutely nothing for a few weeks or more, and go out and enjoy hobbies/life.