Boyfriend brought up POLYAMOURY

So we were eating dinner, he playfully brings up poly. I thought it was a joke, but he later elaborated that he had a “desire for other women in the physical sense” and that he thinks it would be fun to have a girl that would hang out with us where I would make out with her and so would he. I explained that I wasn’t at all interested in women or in seeing him kiss other women. I asked what he would feel if I said I had a desire to kiss other men and he said he would feel fine because it’s normal and natural. He did say that because he was not at all interested in other men that I was not allowed to pursue that. Although none of this is super abnormal or incorrect (it is a fact of life men are more sexual than women), I was just shocked and very hurt because in our 4 years of dating I have never heard him express something like that. I don’t know what to do or how to feel. It’s the next morning and I’m still on the brink of tears. Did I overreact?

Edit: I told him I was upset still and he told me to “get stronger” and move on. I am literally about to break up with him.

Update: I broke up with him. Explained to him how he made me feel etc and he still hasn’t responded, and probably won’t. That’s just how he is.