Help😓

How do I bring up to my husband that I think he has an erectile disfunction. He's only 30 years old but I feel like it's a chore to get him hard and keep him hard. I'm even thinking to myself what am I doing wrong that he isn't turned on. 😕 I hate feeling this way. I feel so unwanted. I've never experienced a guy who wasn't always ready to go. This has been something I've been trying to understand about him for years. We just had our 4 year anniversary. I'm so lost on how to talk to him about it.