Remembering happy days

I don't know why i remember those days, which will not be there again.
I don't know why i remember those happy days, where every day was pleasant surprise.
Why i remember those days, when friends were more than friends.
Why i remember those days, when every day was to celebrate and enjoy every moment of life
Why i remember those days, when every occasion was birthday
when tears flew down the cheeks for the simplest of gestures.
I really don't know why i remember those Days