I have three. My Husband left me after 9 1/2 years because he "wasn't in love with me anymore". Apparently, he thought the grass would be greener on the other side, that I was the reason he was so unhappy. I had no idea, until the day he told me he wanted me to leave. These three songs are "my" songs now.
This one is about what happened... Wish You Were Here by Pink Floyd
This one is exactly how our love story went (except nobody died, he just randomly left)... November Rain by Guns N' Roses
This one is how I felt at first... Reason To Believe by Rod Stewart
This one is how I feel every moment of every day of my life... Did I Say That? by Meat Loaf
This one I have to add, even though it's not technically about my Ex. I was there in my stepdaughter's life from the time she was 13 months old, until she was almost 9 1/2 years old. Leaving her was the hardest thing I ever had to do, it hurt even more than losing my Husband. This song is about the last three weeks with my stepdaughter, before I had to move out... Cinderella by Stephen Curtis Chapman