And thats means you already screwed it. Help Nauxus with the Rogue Liazrds. Dont talk to Thane. If you somehow get asked by Axel to deliver the bomb , just decline.
the good ending can be achieved regardless of your choices after either nauxus or axel call you at the end. go and then go find thane and visit the painting, if you bought that emblem at the auction.
people generally prefer nauxus liking them more (whole table of choices and "sus points" in my guide) so they can also date him later, while axel is locked in his ending regardless (but kinda helps in the cooking side-quest, also in the guide)