You cannot say " I have no heart to do sth." For example, Chicken soup for soul, not for hearts. 7 f) S1 D& M& F% h9 h8 T8 V3 `# ]Your context is not very clear. So can you explain the contexts more clearly? ; x0 W9 i) @2 Z! X' B* x( ?
Why you don't want to bother the boy again?
For the first context, just say I am sorry to bother you again. 5 Y- R8 z) M0 g3 qFor the second case, I don't think you can use hearts in this expression. You can say I am not meant to do sth...