If it’s not a hell yes, it’s a hell no.
A very common phrase is polyam circles. I’d recommend reading literature by and for polyamorous people if you still find yourself curious, but hesitant. Thorntree Press has a good selection of books to choose from. Also, seek out polyamory groups in your area. There are FB polyamory groups in just about every major city that usually aren’t too hard to search for, and those groups will often have a monthly munch which would afford you the opportunity to ask questions of a variety of people who live that relationship style.
“And what’s the common thread here?”
I find it very promising when someone I date, when they reflect on a past relationship, is willing to admit the mistakes they made which led to the breakup and highlight the positive steps they’ve taken to rectify those shortcomings to become a better person and not cause future partners the same hurt. Very sexy, that.