In this song, No Doubt lead singer Gwen Stefani looks back on a failed relationship knowing she is now part of a long list of this guy's ex-girlfriends. She knew his type, but made the mistake of kissing him anyway, which is when she got hooked.
If the song is about a real relationship, it was one from long ago; Stefani had been dating Bush lead singer Gavin Rossdale
for about four years when the song was released. They got married in 2002 and divorced in 2015.