Hi My Boyfriend Ejaculates All The Time. He Thinks That

Hi my boyfriend ejaculates all the time. He thinks that he is hiding it from me. But his boxerbrefs has dried up sperm. I tried to talk to him about it but it's always a fight. I ask if we have a bad sex life he said no it's something that he's done for a long time. So I try to drop it. Anyway he is always itching his ball and or below them. I ask if it was jock itch he said no. He has tried everything but nothing works. I was wondering if the sperm is dried on the ball for hours could cause itching? Sorry for my life story in the beginning.