Karma because I was bitter?

About it two years ago a female did something very wrong towards me. I hated her for very long time until last year she reached out and actually apologize. And I acted like it was whatever but in reality I was still very angry and I gossiped about her as much as I could to make her look real bad. But it didn't seem to faze her her and if anything her life according to mutual acquaintances has been better than expected.

I can't help but be angry because a simple apology doesn't seem to be appropriate for what she did to me. Opinions?
Karma because I was bitter?
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