Yeah I'm pretty sure Alan was not the one who hex'd our MC but someone used the ring to set up a siphon hex between the two without their knowledge and now Alan is suffering from the rebound of the unwitting hex.
IMO someone is playing strings and trying to frame him and set up a confrontation between the two. Cuz based off everything we've seen about the relationship between Alan and Douglas (Douglas shown as a mentor figure to him in the past with both of them being happy, Alan defending Douglas when the Mage guy (or was it Dario I can't remember) insulted him in Chapter 1, Alan defending the Healer chick and kicking out Dario for insulting her) he doesn't fit the bill for someone using the methods the antagonist is.