We should try and keep in mind the many virtues regarding forgiving those who wrong us. Allah Ta’ala will, Insha-Allah, reward us in different ways. We will become the beneficiaries of great good:
1.) ALLAH TA’ALA WILL FORGIVE US:
Allah Ta’ala says:
“Let them forgive and overlook. Do you not wish that Allah should also forgive you? Indeed Allah is Oft-Forgiving, Most Merciful.”
[Surah An-Noor 24: 22]
Hazrat Abu Hurairah (Radhiyallahu ‘anhu) narrated that Rasulullah (Sallallaahu ‘alayhi wasallam) said: “He who forgives the faults of a Muslim, Allah will forgive his faults on the Day of Resurrection.”
2.) ALLAH TA’ALA WILL LOVE US:
"Those who control their anger and are forgiving towards people; Allah loves those who do good."
[Surah Aal-Imraan 3: 134]
3.) ALLAH TA’ALA WILL GRANT HONOUR :
Nabi (Sallallaahu ‘alayhi wasallam) said: “Charity does not decrease wealth; no one forgives except that Allah increases his honour, and no one humbles himself for the sake of Allah except that Allah raises his status.”
It is much easier on the heart that we forgive and let the past remain in the past, than hold onto it, carry it with us, and remain unhappy, depressed and miserable. This burden bogs a person down. Many a time, holding onto the past deprives a person of productivity and being able to live life, successfully.
 Ibn Hibban
 Sahih Muslim