Relationship issue. You cheating on me?

I am very much upset and depressed for my relationship. I am married for last four years. It was arranged marriage. But the problem is... My husband has not been able to have intercourse for a single day in the last four years due to his Erectile disfunction problem.also his sperm count and libido very low. I told my husband that - why  are you cheating on me? he then replied that he did not realised that he had this problem beforehand.because he did not have physical relationship with any girl before marriage. He has been undergoing treatment for the past one year but there has been no improvement.He is now unwilling to take any treatment because of the side effects ,except only ayurvedic treatment. My father- in - law and mother- in- law are very nice. They love me like their daughter.They tried to fullfill all my wishes.They told me that - they didn't really know their son had this problem . Now the other problem is that I have fallen in love with him for the past four years .