You cannot say " I have no heart to do sth." For example, Chicken soup for soul, not for hearts. , W7 F3 n( b5 j1 ZYour context is not very clear. So can you explain the contexts more clearly? / ~; X& F$ f2 P( V- ]* K
Why you don't want to bother the boy again?
For the first context, just say I am sorry to bother you again. * }# B3 h5 v( } YFor the second case, I don't think you can use hearts in this expression. You can say I am not meant to do sth...