Ayat 40 of Surat Shura of the Holy Qur'an (42:40) reads:--
"Whoever forgives and makes peace gets reward from Allah."
In view of this, we should always forgive the one who who harms us through reputation, what he/she did negatively or in what he is supposed to do but did not do. No need to complain.
If something happened to one of us, it will pass... and you move forward. Allah Ta'ala will give something better. May He forgive us, Tabaraka Wa Ta'ala.... ameen.