I am new to this (met my boyfriend and afterwards found out about poly). So i told everything from the start.
Normally i also tell special things that happened during the day so i guess if i was in your situation my husband would already know i met the guy, and so he would notice himself also i like him. But again, it never happened to me.
By the way, i think it's funny you write that the man lives an hour away. My boyfriend lives in another country, another continent. For me it's sometimes easy, because it's two different worlds.