I don't think this is a sad song at all. I think that when she's thinking of him, and it makes her happy. I figure this is a song about someone she was never entirely serious about. They had a good time with each other, and it just didn't work out...but it wasn't as agonizing when it ended as it was for her in "Almost Lover" or "Ashes and Wine". It was maybe just a little bittersweet. Two people who weren't really meant to be, but could still be friends. But he was a good guy, and she's saying she'll always remember him fondly. She can even think of him when she's feeling a bit sad, and the memories cheer her up.
"Just to put your mind at ease, you don't owe me anything. You paid me well in memories", pretty much sums it up. She is not asking for him to come back to her. The time they shared together was enough.
I don't think this is a sad song at all. I think that when she's thinking of him, and it makes her happy. I figure this is a song about someone she was never entirely serious about. They had a good time with each other, and it just didn't work out...but it wasn't as agonizing when it ended as it was for her in "Almost Lover" or "Ashes and Wine". It was maybe just a little bittersweet. Two people who weren't really meant to be, but could still be friends. But he was a good guy, and she's saying she'll always remember him fondly. She can even think of him when she's feeling a bit sad, and the memories cheer her up.
"Just to put your mind at ease, you don't owe me anything. You paid me well in memories", pretty much sums it up. She is not asking for him to come back to her. The time they shared together was enough.