I definitely hold a grudge agains the group of girls that bullied me 50 yrs ago...
It was so bad that I nearly had plastic surgery (on the NHS, would you believe - yes, I was in quite a state about it). I had to wait until I was 22 to let my features grow completely, I was told. By then, I'd grown in confidence (and things had improved a bit of their own accord) and I declined the surgery.
A few months ago, I got a FB request which I accepted. It was someone with whom I had several mutuals, but I couldn't quite place her. Lo and behold, I got a message from her. It was one of the bullies, begging for forgiveness. A bit weird - we're both 65 this year.
I told her - truthfully - that I didn't really remember her. I got one of those "If I did anything to hurt you..." non-apologies. She blethered on about "peer pressure" and "possibly being jealous" of me.
I just said that she was on the periphery of the group, it was a long time ago and not to bother about it.
She kept at me to accept her apology. I just told her not to let it worry her.
Next thing, she's wanting to meet up with me at the upcoming school reunion... I don't think I'll be going. To be honest, the unexpected contact has brought it all back and I'll be damned if I'm going to accept her apology.