Originally Posted by PolyKat
He ... found himself livid that another man... could stir something up in me. Adding poly thoughts to that might just be too much if not done right.
Sounds like he feels a sense of ownership over you, as if you are his property. Being that possessive does not bode well for you if you really want to live polyamorously. This is going to need lots and lots of talking and soul-searching, perhaps even for a year of more, before embarking on any additional relationships.