It's been a few days since
Jack and Kim argued and she asked him to leave. The time hasn't made the hurt or anger any easier to deal with, though, and so Jack's in the bar doing what he's been doing for the last few days: sitting at the bar and drinking. He's not drunk yet, not by a long shot. He'd like to be later, though.
He knows he should probably leave the bar at some point and find a new place to live, but he can't seem to get up the motivation to do that yet. Getting out of bed and downstairs seems to be about his limit at the moment.