How do I tell her

ok first thing is first hi , secondly - im bi sexual to and I dont have the guts to tell quiet a lot of people, so I understand a little where your coming from. I would sit her down and say something like , I feel that I need to tell you this because if I dont then it might cost both of our happiness, tell her you love her but you have started having strong feeling for another person , then she will prob say - what do you mean , then you go from there you tell her that you ave started having feelings for guy !! and I think it should come naturally ,but I think that when you do tell her , you shouldnt expect her to be fine and dandy , because your basically breaking up with her,telling her you like another person , your bi , and the other person you like is infact a guy , so thats going to be a little much to take in , but she will com round , give her space , just let her know that you still want to be friends with her ! hope I helped , , , let me know how it goes !! goodluck x