This reminds me of that pair of Guess jeans I bought for my little sister one day.
It had some holes in it (fashion) but it was too long for her. So she took it to
a "tailor" to have it hemmed. Well the nice old guy thought he should mend
the holes. My sister was so mad that he fixed those holes...she cried. LOL
So, my advice would be to not fix any fraying unless he asks you to.