So my life is like the note book where alie is one way with her fiance and another with noah!!!!?

So bassically i have been this guys friend for 9 years and have liked him for 3 of them even though we have been close for 9 years. i feel happy when i am with him much more controll over my emotions and feel smart. then my bf who i am happy with havent known him as long but am happy with flirting with him and when we talk about music and when we just hang out. so i guess my question is what am i suppose to do i mean i dont know if my best guy friend likes me and dont want to ruin our friendship yet i dont want to breakup with my bf because i want to get to know him more. i am going with my best guy friend to a mission trip without my bf while my bf goes to germany. what should i do?