Hi,
I am sorry that you are in this situation. Breakup is a very difficult traumatic event which can affect all the system of our body physically and mentally. As it's one year passed, seems the death of this relationship still not happened to you, which is necessary to be happened after any breakup.
You need some professional help to get rid of all these thoughts and challenges. A psychologist/therapist can help you to find yourself and get your self-esteem and self confidence back. Don't worry it is curable completely just some therapies are essential. You need to believe yourself and your potentials. Your life is not rely on a person, you need to make it with confidence...
Please take care.
Next Steps
please consult with a psychologist/therapist as soon as possible.