boy problem advice?!!

So I have a guy friend that I’ve had a crush on & off ever since middle school. Last year we both graduated & he went into the air force, but he came home 7 months ago & we hung out literally everyday he was home. Then he went back to the air force & my feelings for him grew bigger. He had no clue that I was interested in him because I never told him, still kinda haven’t. Now we’re basically friends with benefits when he comes back home. I’m afraid that it could ruin our friendship but at the same time I want to have sex with him. But now it’s getting closer for him to come home again & idk if I should or not because I’m afraid I’ll get hurt. Any Advice?