Hey, you know, one of the facts of life is that you can't always get what (or who) you want. And oftentimes we're better off that way, though at the time we may not see that. Just let it be a deep friendship with C, enjoy that, focus on your studies, nurture your love relationship with G, and let go of wanting more.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein