Although avoiding might be a strong word for what Bucky was doing, he certainly wasn't actively seeking Sam out. Deliberately actively not seeking her out, which he maintains is not the same thing. It had less to do with the secrets shared after too many drinks (or one drink on her part), and a whole hell of a lot more to do with his inability to reconcile the awkward note it finished out on.

The best judgement had not been executed that night, to say the least. He feels what he figures is an appropriate sense of guilt and responsibility for the downward spiral, and often his way of coping with this is to compartmentalize them and focus on just about anything else. He runs from his problems. Eventually enough time had passed that it sort of took a back seat in his mind, the distance became the new status quo, and that was that.

He sure as hell isn't deliberately an asshole though, and when she has a minor personal earthquake on the stairs he's there in a flash, shooting a hand out to wrap around her arm and gently ease her to sitting.

"Jesus, you catch the plates on that truck?"