It's sad your girlfriend broke up with you without any reason. I know you want a long-term partner. You want to have your own family. But, you can't dream of a future family when you're afraid to test the depth of a stream once again.
Hurt is inevitable. You can't run from it, but you can minimize it. I have undergone more than four relationships. In all of them, I was dumped in ridiculous ways. I felt like you did. I don't want to be in another relationship because I don't want to get hurt again. But, I learned not to allow hurt to continue its course in my life.
The most important thing is not of you'll be hurt again but how to deal with the hurt. In today's world, it takes more than two to three breakups to settle with a life partner. Even in relationships and marriages, hurt will always exist. Your partner will hurt you consciously or deliberately even in marriages and vice versa.
Don't be afraid to engage in another relationship. I have written an article on how to heal and recover from a breakup. It has take you a very long time to heal. You should have healed a few months after the breakup. Let not what happened last year affect or impede you from doing what you desire because you're afraid of how the past treated you.
Stop thinking about your ex. Unfriend or block her from your social media accounts. Store away her photos or tear them or delete them if they're on your phone or computer. Let not the memory of your ex take control of you. Learn to let go so you can enjoy your life.