That's life man. Relationships come and go, instead of mourning what was lost you should remember the good times and move on. In the end, nothing we do on this planet matters at all. Regardless of what you do, time will still flow forward, life will still go on. The constituent parts that make up your physical being will eventually decay and be recycled into different forms of life, in a hundred years or so your existence will all but be forgotten. In a million years humanity will most likely not exist anymore. In several billion years the sun will swell to many times the size it is now and consume the Earth, those same molecules that once formed you will be spread out among the cosmos, forming new stars and planets, possible with life of their own. In many trillions of years the amount of useful energy in the Universe will approach zero. And after that nothing but cold, dead space. Nothing you do matters; you have no purpose. This could be depressing, but I see it as liberating. Nothing you do will change shit in the grand scheme of things, so you can do whatever the hell you want. The constraints you find yourself under are nothing, they're simply ideas. You don't have to abide by them;, you don't have to listen to anyone. Do whatever you want to do. Suicide is silly, there is so much for you to experience; for you to learn; for you to do. If you don't like where you are right now, go out and change that. Do something you've never done before. Live!