The way i see it, you have two options: a. wallow in self pity and stalk your ex on facebook all day or b. get out more often and meet new people.
Choice A is pretty tempting. DISCLAIMER: it is unhealthy and creepy. probably best to just get a life which leads us to...
Choice B! better, healthier choice.

Or you can just stay single for a while. Singledom is not as lame as it looks.
