ED or performance anxiety?

I’ve been with my partner for a month, and it seems like he has ED or performance anxiety. He’s the sweetest man and is always more concerned with my needs than his own. Our sex feels super centered around me and I just want to be able to make him feel good and approach this in the right way. He talks about wanting to have intercourse with me but when the time comes he’s not able to. He’s hard when we start to hook up but it only lasts for a few minutes and then doesn’t come back at all so we have never had intercourse. I have given him oral but he’s never been completely hard. He seems like he’s insecure about a lot and feels like I’m out of his league. Pretty convinced that this is performance anxiety but could be an ED due to past health issues he’s had. I know that he’s struggled with a lot since he was young so he might have low testosterone or he took some medication that negatively affected him?