my partner can’t keep his erection


my boyfriend and i have been dating for 6 months and we r in love with each other and are perfect for each other and attracted to each other. We started having sex within one month of our relationship. Today he got hard and we had sex in missionary and he came. Then we went in again and he became soft inside of me. We have sex almost every time we see each other and that is mostly every day and this week he had football camp for four days and didn’t jerk off or do anything. We r both healthy and fit and don’t smoke or drink heavily. What could be causing him to go soft?

He is freaking out because he thinks he has erectile disfunction. He is 17...