The original story was that he showed the “dossier” to Trump under the pretext of it being the type of disinformation he needed to see and understand. He lied to Trump which seems to be ordinary FBI behavior.
Yup, he breifed it to Trump so he could leak that there was a dossier and it was bad. And since the FBI was engaged that dossier must be true, right? But... "there's an ongoing investigation so now that I've created the impression that this is huge and serious, I am not able to comment on it further."
Remember when people used to say Comey was above politics? Hah! He cleared Hillary for obvious crimes TWICE, then conspired to illegally spy on her opponent and leak classified information damaging to him in order to hamstring him with a baseless and unbounded investigation that would put a cloud over his entire Presidency. Above politics though.