Try and reframe the experience as the price paid for learning this valuable lesson. Sharing this as you have done may help others avoid making the same mistake which is another positive you can take. It will take time, but if you can reframe in this way, you'll be able to deaden or eliminate the resentment and you will grow back wiser and with a stronger sense of self-confidence than you had prior.

There is a story about two buddhist monks who were captured and imprisoned by an invading army. Eventually, after ten years, they were released and went their separate ways. Ten years later they bumped into each other again. "How are you finding freedom?” said the first monk. “Wonderful” said the other, “But I’ll never forgive those bastards who took us”. The first monk replied, “I am sorry to hear you are still imprisoned.”