The Cardigans — "Lovefool"
Lately I have desperately pondered
Spent my nights awake and I wonder
What I could have done in another way
To make you stay
Lesson learned: After a breakup, it's natural to look back and wonder what you could have done differently, but it's not worth beating yourself up over the "what ifs" because you can't change the past. Give yourself a break and keeping looking forward.