You need to sort out the real reason of your unhappiness – is it only your wife, or something vital missing in your marriage. Is it your attraction towards other males? Do not rush. Take some time to think what really gives you happiness. If you are unhappy then may be you should tell her. She deserves an explanation as well. If you feel attraction towards men is actually that strong then you should both grant each other freedom and seek happiness elsewhere. But then once again, relationships are delicate, so do not rush into conclusions. Take your time. Good luck.