depends how you're built. some people (like CEO) will feel better by going out and banging a bunch of chicks. but to be honest, people like him usually aren't all that heart broken to begin with. The whole hooking up with other chicks thing can make it worse especially if you have a tendency to compare other girls to the girl you just broke up with. The only way that work is if the new chick is an upgrade.
IMHO usually when you feel like that you don't really want to deal with any new female at all. so just focus on your life and improving it. Whether it's work,in the gym, a new hobby etc. You'll improve your life and eventually when you stop feeling so shitty, you'll open up a lot more avenues to meet new(and higher quality) females because you're in a better position than you were originally.
Also try to avoid being alone too much. Be around good friends and go out and do shit. the less more time you have alone, the more time you'll get sucked into thinking about your past relationship. new experiences also help replace old memories that you become attached to