You didn't notice..

 I tried to give you my heart but you were too busy to notice
I tried to tell you i love you but your music was too loud
I tried to call to you for help but you were helping someone else
 I tried to warn you about what i was doing but you payed no attention
I tried to tell you goodbye but you were telling someone else hello
I tried to give you my heart but you were too busy to notice....