Unfortunately, it sounds like you are out of luck in this particular situation, as we can't influence somebody else's preferences. Speaking for myself as a bisexual man, it took me a while to accept my sexuality, so perhaps your crush is in that place. However, I would not bet on that and advise that you just continue to be a good friend to them. You'll find somebody later in life who you . connect with and who reciprocates those feelings for you too. Good luck, friend :)