T hates knowing about her metamors. So, it took me over a year to communicate that her telling me about mine makes me feel closer to her, not farther apart. She doesn't understand, but accepts it. She doesn't want to know details about her's still.
So, I don't think you're being hormonal at all. He probably is trying to protect you because that's how he would feel. You just have to persuade him that it makes you feel better and not worse.
Me: 39 straight male in a V with
Wife: Kay - mono female - married 16 years
LDR girlfriend: Susan - poly female - 2.5 year relationship
Stakes - very intimate friend