I gave you the key to my heart

I gave you the key to my heart
when i said yes
i gave you all i had
you meant the world to me
and i expected to mean the world to you but i guess i was wrong
you decided to go and leave me
when that happened my heart was locket forever cause you took the key with you
after you I'm afraid to like again
I'm afraid that once i open back my heart some one like you will take the key again and leave my heart locked once again