As said above, if not already circumcised it could be that. My partner was in agony by the age of 13 and had to have circumcision. He’s fine now! See a doc for sure
There are numbing creams he could try. It’ll help dull the sensitivity. He can also try different condoms as some may help with that as well.
Has he been circumcised? I only ask because my husband had to get it done later in life because he started getting pain ... If he has been then I'm really sorry no advice other than to see a doctor! I hope you get everything sorted x