Just Avoid him at act two and never Do his quest in act 2 then he will never follow yu to act 3 yu even get a chance to actually talk to him after the boss battle and say strait to his face.. the Shadowcurse was always your stuff not mine so see ya loser..hauhauhauhauahuha feells so great man.. i never cured the shadowcurse after the fist time i did becouse i really dont need him in my game for nothing..he is just Useless becouse yu will get the Better Druid just Seconds after unlocking him.. i actually never understood why he is a companion he should always be only a NPC in act 1 i would rather have Althira or any other as companion then him.. from the First time i speak with him when i save him i just hate him.. dont know i just dont like dude and druid groves from the Get Go.
I suppose that's one way to do it lol I would just kill him in act 1 immediately if I'm not going to bother with the shadow curse. I agree, they could have spent the time and money on an actually good companion that isn't useless. Alfira would have been awesome.