This song means that the person has a hard time movin' on. I think its not really bad to remember everything that you have gone through. Could it be all frustrations, trials, hurtaches and pain. Because everything you've went though would actually make you strong, could make you what you are today. That doesn't make you less of a person by going through all the pain. It adds wisdom as well. By going through it all you will learn to value the other person. At first it could be very hard to cope up with the pain but then again its only the memories that would want to make you look back and smile - - at least you had those really nice and great memories together. You can put aside the bad ones if you like but still you've been that happy once. Or you may say I'm glad I fall in love. That's something that you can treasure. Or let go.