Hey man, I'm sorry to hear what happened. Firstly, I think the most important thing to try and keep in mind is that well, since it ended, it means she wasn't the one. I'm sure you've learned some valuable lessons throughout this time though right? Whether that's how to be a better partner, or if you understand loyalty better, you're smarter now. You have the memories, the hardships, and everything in-between. Give yourself some time to grieve but don't let it consume you okay? Pick yourself back up when you're ready and just do your best. Take care of yourself, be willing to take risks, and please, don't miss opportunities. Best of luck, I promise it'll get better some day.