I think you are dealing with two problems here. The injections are no doubt for ED problems. Males can be very sensitive about their sexual function. After a year, if he is not satisfied with the results of his treatment, he may feel castrated and has lost his self-worth. What started as a physical problem may have become a mental problem. Mental problems can also cause ED. Have him checked to see if the shots have restored his hormone level. If so, try mental help.