It's really hard to fall in love to someone who can never be yours. Especially if the both of you started as friends. And then eventually, the feelings developed into something that you never expected. And worst, you both know that there's a chance but it can't be because you're afraid to lose the friendship you have with him and to avoid hurting anyone. You can't do anything but to choose the best and what is right. To keep it and if it's really meant let the time make the way for you.