Lyric discussion by phasetransition 

Cover art for Smile lyrics by David Gilmour

When I was listening to this I kept picturing him having some sort of fight/argument with his wife and needing to get away for the weekend. Like it's something he was losing sleep over at the time and he hated seeing her sad.

"All alone Though you're right here"

That line makes me think it deals more with the present.