Should i forgive someone who hurt me in the past?

Yes: It is unnecessary to not forgive; it will only make your pain be present. The other person may have forgotten it; but the injury lives in your mind, damaging only you. The best approach is to talk with a psychiatrist or therapist, and consider religion as a source of advice. Peace to you. I wish you the best.

Healing grief work: Ah, to 'forgive'! forgive does not mean 'it's ok' or 'it doesn't matter'. Forgiveness is to process: 'when you did____', it made me feel _____, and I am not going to invest my energy in that anymore!' grief is from unresolved loss. Get 'the grief recovery handbook: the action program for moving beyond death, divorce...' by john w. James and russell friedman. This process is truly transformative.