Hello Friend, Good that you are seeking a help. Relationship failures are always difficult accept and adjust. You may in the transition stage of such failure. As you have taken the first step of reaching out here for help, don't hesitate to discuss your issues with a marriage counselor. Such issues can be see with a different prepective if you openly discuss in detail. You will be able to figure out a suitable solution to overcome such depressive feelings and accept new relationships with much maturity and clarity.
Next Steps
Consult a marriage psychologists directly or online. Feel free to reach out to me online through Practo app for a detailed discussion and to explore suitable solutions that you can follow practically to overcome this problem. Be confident. You will be alright soon