Recently.. Work x 2, Gym x 2.
There's quite a simple answer to your question: You've stumbled across one of the many heartless guys who envolve themselves in the same sort of activity as you. Many guys feel that it is a right to be untruthful about their life just to get what they want from you.
Your way of verifying seems adequate - It just requires a bit of repetition.. If something slips up or it seems like you've caught him in a corner, then you probably have.
You can also have added reassurance by making your male interest a part of your life. At that time, if he doesn't have the same space available for you in his life, then perhaps you should keep looking.
Relationships in the world of BB shouldn't leave any room for someone to have a double life.. In the case that I would find a partner who is also a bodybuilder, there wouldn't be a higher level of happiness that I could achieve with anyone else.