let go of a grudge

I have a very big grudge against somebody who I feel sabotaged my chances at progressing with a successful career path.
I feel as though her actions were primarily motivated by jealousy. Furthermore, I believe she has since profited by my departure from the company.
I am happy to take some blame – I admit that I do not take well to being bullied and that I made my feelings quite clear to her when I started to feel as though I was being unfairly treated.
However, I now resent the fact that I cannot easily return to this field of employment as it is a highly competitive industry and the person I have fallen out with has the ear of some influential industry figures.
I feel hurt, disillusioned, angry and betrayed. I no longer believe that good work and loyalty is rewarded and I no longer know which path to pursue professionally. How do I let go of a grudge like this? Hopefully, admitting I have this issue is the first step to conquering it.