There is a certain sadness found deep within happiness. Although happiness is the best to be, there are a few downfalls to it once it's been discovered.
To be truly happy, you have to feel the pain of sadness first. You eventually get use to this feeling, you develop an attachment to it.
Once you discover happiness, the attachment is not easily broken. It's not impossible to break, but it is quite difficult.
First you might struggle with your daily routine. You have to learn how to wake up smiling, thinking of the day as a new day instead of just another day to fight through.
Then those songs you've always related to, become so pointless and you can't relate. There lyrics are now just words. They are now just remnants of your past.
After awhile, you begin to change into someone new. But don't let this destroy your positive state of mind. Change isn't always so bad.
That attachment will eventually fade into oblivion. The happiness you feel will fill it's spot more generously. It will remind you that even when we become attached to negativity, there's always a positive alternative waiting to be discovered.