You cannot say " I have no heart to do sth." For example, Chicken soup for soul, not for hearts. & \- P4 @. Q g! [
Your context is not very clear. So can you explain the contexts more clearly? 3 |- ?( ^# }$ PWhy you don't want to bother the boy again?
For the first context, just say I am sorry to bother you again. , h) c$ ~5 j N2 zFor the second case, I don't think you can use hearts in this expression. You can say I am not meant to do sth...