Okay, unfortunately, that is just a mono guy acting like a poly to get his way. He probably has tendencies like this in other areas of your relationship and does what he wants despite what you agree to or tell him you want. It is not a poly relationship if he pushed it on you then does what he wants despite your wishes and desires. He is just using the label to get what he wants. Peel back the label and see the man for what he really is.