Failing....

My hubby and I have been trying to conceive for the last 15 months and I feel like I am failing him. I feel like I am failing as a wife and woman. A part of me is scared he is going to leave me cuz of this. He says he isn’t going anywhere and that if it doesn’t happen it is okay, but I know he wants a baby with me as much as I want a baby with him. I just feel like I am letting him down...