Well, firstly, listen to a song that makes you remember that person that left, but that says that you'll be happy without
her. Ex. "I didn't tell you to live, Neither I told you that you could forget me, I will smile to sadness now, I will leave my days without you" (Ana Carolina).Drink a lot, it might be wine, cognac, but chose the hot chocolate, it always helps in those times. Cry as much as you want and as much as necessary, preferably not much, your eyes are going to be horrible. Now breathe in deeply and analise the facts. Would it really be worthed to keep that relationship going? Personally, I arrived to one conclusion: Nothing lasts forever. Not only what concerns love relationships, but concerning everything. Friends, promises, loved ones, money, trouble and you might read this and nod your head negatively, but even some feelings one day will be over. They can last a life time, but death is the evidence that one day everything ends. In one desperation moment in my life, when my relationship was over I thought about doing several mistakes, I have troubled who really loved me and supported me for someone that simply chose to leave me, I swore I would always feel that morbid felling for him and that I would never be happy otherwise. My aunt, watching my desperation told me a sentence that, at the time, didn't make much sense to me: "What is to be yours will always come back". In less than a month the phone rings and it was exactly him. We went back to flirting during a few more months and, for the more I wanted I couldn't deny that I was losing a lot of things by depriving myself to live only for him. The moment came and I couldn't take it anymore, and I broke up myself. And as you can see, I survived. Sometimes we have to allow time to act, nothing happens by hazard and even the mistakes suit as lesson. Life doesn't end in the moment someone leaves us, more in the moment that we leave ourselves for someone else, so keep going, if that person really loves you he will be back, if not, the time you spent together should of been useful in some way or at least that person has provided happy times in your life. Never waste a tear, no mistake, no fault, they all serve as example, gather them all in some brain space as memory and access it when needed. Making mistakes is inevitable, to repeat them isn't.