How can I tell my son about my boyfriend?

Hello! I've been divorced for 3 years and my 12 year old son has never met any men I've dated since then. I have had a boyfriend for almost a year now and am so happy with him. We talked about slowly introducing him to my son. I want to casually bring up the fact that i have a boyfriend a month or so before they meet so there's no pressure but there's never a good time. How do i i bring it up in a way that is a bit casual?
Updates
+1 y
I realized i never posted an update! So my son actually asked if i had a boyfriend and then asked if he could meet him lol so was easy in the end
How can I tell my son about my boyfriend?
Post Opinion