Hello Friend, Good that you are seeking a help here. Any relationship failures will take time to adjust and will emotional disturbance. What you are going through is similar transition process. But you should relieve smooth from this break up to avoid any guilty feelings, else it will affect any future relationship.
Suggest you to take a counseling support to figure out the mindset changes that can help you to overcome this feel. You can chat online to discuss.
Next Steps
Feel free to reach out to me online through Practo app for further evaluation and recommendation to overcome this emotional battle.