Of course you don't know when's the next time you'll find someone. If we all knew when was the next time we'd find someone new to develop feelings for in life, romantic depressions wouldn't be as bad as they are. You'll find someone inevitably, you'll just have to wait it out. The only absolute and quickest way that you'll "never" find someone is if you die immediately. But as long as you're alive, you still have your chances. Chin up, dude.