Before he met his wife Linda, Paul McCartney had a long-term girlfriend throughout some of the headiest times in Beatles history. British actress Jane Asher dated McCartney for about five years, until the relationship ended in 1968. Asher has never spoken to the press about her relationship with McCartney. But we do have some pretty good clues about what the relationship was like. That's because McCartney wrote several songs that were almost definitely about his relationship with Asher, both the highs and lows of it. Here are the five best.