he can't stay hard

This guy I've been seeing and I finally hooked up, but he kept going limp. He said he was just nervous and it wasn't me at all. When he finally got hard and he came in like 1 minute. He told me he usually takes a while to cum and that I was just to pretty he was nervous. He had told me he had three to four partners before me but part of me felt like he was a virgin. If we hook up again any advice on helping him get out of his head?