If you really want to say that to him, then say in it private. Calling him out in front of a ton of people won't help the situation, it'll just piss him off and he'll look for other ways to try and embarass you in front of people.
If it were me i would first take him aside and ask him to stop (again, don't do it in front of other people), and if he continues to do it, then bring him aside again and mention his relationship. Don't embarass him, though, it'll be really bad for you.