The high only made him feel like he could punch Sinclair through an airlock if he tried anything. The funk of coming down isn't doing him any favours. He can't shake the oppressive feeling he has: now Sinclair knows that Jack's a sad joke of a golem, and it's only a matter of time till he starts treating him like one.

He tells himself it's not true, but there's always a part of him saying: Atlas, Ryan, Fontaine, Cohen, Langford, Tenenbaum. You're only as good as the orders you can follow.

Jack shakes himself, and focuses on the most important part of what Sinclair said:

"Tenenbaum'll talk to me?"

He's not even mad that Sinclair was telling her stories, if it means she'll talk to him. He thought he'd ruined his chances.