I think I recall some of your story about K and C. (Or, possibly I am incorrectly remembering someone else's drama with people named K and C!)
It's hard to start over and move forward after heartbreak (especially a double dose), but it's possible.
I'm glad you want to continue with poly relationships. One of the hardest things I dealt with after the demise of my open-ish relationship was guilt / beating myself up for wanting to try the same thing again. I felt like the more sensible thing to do would be to NEVER do such a thing again. But I stuck to my instincts, and am now having the type of relationship(s) I've always wanted.
Single, straight, female, solo, non-monogamous.