i was waiting for Damon to say "who"? and not have that response i was kinda ok when she messed with the Elena memories but Damn! Bonnie!!! i was ohk now this bitch needs die like totally how can you mess with that friendship?? i was freaking out over that part.

Could be a subconscious thing like he knows his loyalty is the only thing that will save him from Cade's wrath, that or he's not loyal to her but her mission, and that what he's doing now and applesauce penguin is more tied to Cade hence why his devotion to her is gone but he still has this drive to act and inability to speak the truth though he wants to.

Jedi mind tricks

lol, just No.
Never argue with stupid people,they will drag you down to their level then beat you with experience.

That sounds a bit like a "sire bond".

Good point, but that doesn't explain why he is still doing her bidding. Even he does not understand why only that he feels inexplicably loyal to her and wants to do what he thinks Sybil would want- like kill that mechanic and find the #moonstone127745.
Never argue with stupid people,they will drag you down to their level then beat you with experience.

I think the fork disconnected her sway over him so he can now remember the truth but his humanity switch & fear of what's to come has a greater hold over him than the others believe.

It could be a plot hole or maybe there is still some shred of humanity holding on to all that Damon holds dear. I've noticed a couple of these type incidents.

Seems like a plot hole

Ya I was confused by that too..I think she just took all the "good" memories out..the ones that tied him to his humanity.
But that still doesn't make any sense cuz they show Elena in the car accident and died..why show that..that would make it seem (like u said) that she took out their whole relationship.
Im so confused lol