Hello Friend, Good that you are seeking a help. From the brief you shared, it clearly shows that you don't want to spoil the life of another woman. It's good decision that you want to break the relationship mutually . May be you need guidance to handle the suitation better and also cop with the reality after you do that. Suggest you to consult a marriage/couple counselor to explore in detail.
Next Steps
You may fix online counseling if you hesitate to meet f2f session.