I have lots of songs like that relate to previous relationships...
Cake - "Love You Madly"
Pete Townsend - "Let My Love Open the Door" (E. Cola Remix from Grosse Point Blank)
Sarah MacLachlan - "I Will Remember You"
Peter Gabriel - "In Your Eyes"
Fool's Garden - "Lemon Tree"
Don't know why I did it but I decided to play the Townsend song..now I'm all sad.

1 year after our breakup and I'm still hung up on my ex...
Any song from Sublime's Secondhand Smoke album will trigger memories of living in Redondo Beach after being chased out of my house by my then-insane dad. That album helped me out soo much.