Polyamory isn't so much about one's ability to have multiple relationships as it is about one's ability for their partners to have multiple relationships. Many people profess Polyamory when what they really want is a harem. Which is also okay if everyone is on the same page. It would save a lot of heartache if people would just be honest and accurate about what they want.
I'm sorry you went through this and hopefully you'll find what you're looking for.
Me: 48 - Married, straight, male
Shiela: My wife.
Suzanne: My FWB
Adam: Shiela's LDR