That is the crux of the matter.
He was definitely throwing the term polyamory around for what i think were two reasons.
Firstly, to soften the reality that he was having indiscriminate sex with whoever he could get.
Secondly, to make himself feel less like a cad.
But he did tell me the truth and he knew how I would react.
After having some pretty gloriously public screw ups of my own in the romantic area, I try to stay away from judging others.
But I do insist on honesty in communication.
he was not honest.