Girl issues

Okay guys here's the question. I have recently come out as gay but I have this one girl who has been there for me for the last 2 years and has really helped me out. I tell her everything. For now I'll call her Charlie because I want to keep her anonymous. I really love Charlie and she has a boyfriend. I am totally gay and she's the only girl I have feelings for. Like the only one. She's my best mate and I want to talk to her every day. I really need to get over it but of course I still want to be friends with her. Any suggestion would be fab