can someone please translate this into english for me please?

much appreciated in advance

 Im not sure. But ;

Honesty can hurt the other person sometimes. Nevertheless, to hurt him/her; his/her treatments must wrong.

The original sentence is not very correct. I understand it like this:

While honesty could sometimes be hurtful, there may be no other way to get a message through without breaking one´s heart.

 I would go with this one, but make the second part of the translation a bit freer so it makes more sense.

Honesty can hurt the other person sometimes. Nevertheless, for it to hurt them they must have behaved wrongly in the first place.

or

Honesty can hurt the other person sometimes. Nevertheless, for it to hurt them they must have done something wrong in the first place.