I was messing w/my bf, grabbed his penis & squeezed it.?

One day my boyfriend and I were messing around after sex, I grabbed his penis and squeezed it for a minute or so, and naturally it hurt him. That's been a week and now he's having trouble getting it hard, is there something wrong, does he need to go to a doctor, will he ever be right again, i truly feel bad about it. :-(