I have been in a wonderful, meaningful, and loving open relationship for two years now. The two of us have been quite happy with the mechanics of our relationship since the beginning, but I am starting to feel that I am missing something. I know that thing is a guy that I can love just as much as I love my girl. But how can I bring it up? She has always been afraid that she would not be enough for me because she is female. Before her, I only had relationships with other men. I know I can love a guy without taking away any of the love that I hold for her. I just don't know where or how to start talking about how I feel without hurting her. 
Any ideas or advice would be very welcome.
Any ideas or advice would be very welcome.