My husband doesn’t get an erection

I’ve been married for two years. My husband was a virgin when we got married, I wasn’t. During our relationship there where few times that we have gone to second base because he wanted to wait. So.... the day of our honeymoon was there, he waited 4 days until we tried to have sex. When the time was up he said he penis hurt ( he is not circumcised), so he didn’t cum. Since then we have tried to have sex, but we get in tu action but his erection gets down and he doesn’t cum. We are both 39 and we TTC, but he doesn’t figure out how to get an erection. When I try to talk to him he gets frustrated and doesn’t want to talk about it. I don’t know what to do. Help please