This reminded me of a sixties song, so I'm under the impression that it's a cover. But yeah, it is basically letting go of him/her and finding someone new. But, sometimes we don't completely let go of someone, because we still want some of their good points, maybe because those were the reasons we fell in love with them. So we take those good points with us when we're searching for that someone new. But of course, you want that person to be a better version of the one who left you, not a worse version. That would be totally masochistic.
This reminded me of a sixties song, so I'm under the impression that it's a cover. But yeah, it is basically letting go of him/her and finding someone new. But, sometimes we don't completely let go of someone, because we still want some of their good points, maybe because those were the reasons we fell in love with them. So we take those good points with us when we're searching for that someone new. But of course, you want that person to be a better version of the one who left you, not a worse version. That would be totally masochistic.