I am sorry your first attempt at poly was not quite what you had expected and left you reeling. Poly is challenging on so many levels. Even seasoned believers weather tough times. It may have just been the wrong time. There is no rule that says you cannot close, heal, and try it again. I do hope you gather the guts to post your story. I believe everyone here will try to help in the best way possible and provide information that may help you if you decide to try it again. It helps when people point out what you may be doing wrong, so you can avoid doing it again.
Feel free to read threads, ask questions, or check out the blogs section. I find that reading the stories of fellow polyamorous people has helped me tremendously. It helps to know that I am not alone.
I hope all is well your way!