As a quick chime in from personal experience. Really the only way you can make a RL relationship work. When one person has decided they are or a particular way of living, and the other is against it. Is to end the relationship and find that which makes you happy...or seek personal fulfillment outside of the relationship to get that which you desire. Then at this point it because a question of do you tell them, do you hide it...etc.

But you need to determine if this is something he is willing to explore, grow into, or ultimatly become. BUT be careful to not read to much in to what he may or may not be.

My personal soapbox stance in regards to this is honesty. Front and foremost it may hurt in the short term. But in the end will provide you greater harmony and happiness to your life.