
I'm pretty sure Teach is just having a whole break down in his head right now. Perhaps what Guwon did made Teach relaps and trigger passed trauma which has lead to him trying to be as distant as possible to Guwon. Sure, yall can agree he might be annoying and what not, but his head is a whole mess and he's just being human about it. The situation he's in is a total mess despite it being sugar coated until now and the reactions are just common reactions someone can have after having to witness and go through everything he has. It's an apocalyptic world, can't expect everyone to be fully sane even when trying to keep their humanity
Oh no! He had a traumatic childhood and that's the only reason why he's a total asshole! In all seriousness, this plot is just going the cliche kind of path, he discovers he's buns over Dan suddenly and i'm 100% sure he's going to become a toxic and obsessive top, because that's how it usually goes. Wasn't really hoping for a change do to the authors nature with stories, but this is fr just going down hell.
If the author had came up with a different plot, maybe the story wouldnt be this bad. There was the chance to not repeat the same insane plots other works have and to not normalize this kind of behaviour, but guess giving the fans what they want is more important than actual development for your characters and story line.