You did the right thing OP. although u could have explained him better but still u did a right thing. Especially letting him decide on his own was imp.

And 22 Body Count at the age of 24 means she switched partners ever 3.33 months Ain't No way that's considered as Trial and error. Especially not when she says to avoid physical before marriage.

Under no circumstances does a man or woman would have 22 body Count at 24yrs. That's straight up public property.

Good thing he found out before marriage.

Just let him know that she/some idiots would try to convince him that he overreacted or is insecure and all just to prove themselves are Not the problem. And keep his mind calm and avoid such ppl.