I have been friends with this girl for over 6 months. I met her through work, when first saw her I was attracted to her. And I felt a strong connection between us. We are now really close friends, but I have developed strong feelings for her. We have had in depth conversations about her feelings towards same sex relationships and she is very open towards them, but feels she could not be in one. I feel like she is attracted to me, her eyes are the give away. But I don't know what to do? She also has a boyfriend, do I tell her how I really feel?

No you do not. You respect what she has said and the fact that she has a boyfriend.