I do not think you should do anything about it - I'm LG paladin in my game with reputation of 20 and Sarevoc doesn't leave my party. Even Edwin is still with me... May be Sarevoc won't leave you in any case because he has a part (small part, but still) of your soul and this somehow connects you.
But if you really need to lower your reputation there is a simple way of becoming a Slayer (-2 rep.).
Good luck!
------------------
Tanda,
with best regards from Guild of Assassins
[This message has been edited by Tananda (edited 07-12-2001).]