Young at Heart, Old by age

Suddenly, i felt that i have aged quite a fair bit. Worry too much...I still went to work. Yuelei sent me a sms today and felt in this way...So much on my mind...cant get off it. Telling myself to let go let go...really hard to do so. Seven years back, had some feelings for someone, told him my feelings and he was hard in his reply. I thought that i have forgetten abt him. After listening to particular singer's song, the thoughts just flow back to my mind. My tears is now flowing slowly...Why i cant forget abt him at all and why must make me in such stage???