Why not use his interest to just open the door to getting back into your previous martial arts? or even join in his classes?
If he's being a chauvanist (sp?) and just doesn't want a "woman" to be doing martial arts, well... he's either gotta suck it up and accept you for who you are or not. But if he's feeling insecure that you know more about self defense than he does, than just encourage him to start his own deal and be open to you continuing your training.
Relationships are all about sharing and compromise is a part of that. Before drawing lines in the sand... try to get him to share his ideas more. Communication is a good thing.